Honestly, defending his ego with a pic of him bragging about being pious doesn't help your cause.
It's not exactly him bragging about being pious as much as it is him being upset that someone is handwaving away his entire career under the JLI. Hell, he explcitly says that the JLI weren't just pompous, self-righteous airbags, they were people with flaws, but they still did their best to defend the earth from big cosmic threats like Despero.
won't claim to be an expert on Booster Gold. What little I have seen/read of him has taught me he is egocentric and cares more for his own publicity than that of the lives of the innocent or helping out the JL.
For your convenience, I'll outline a brief history of Booster Gold (complete with pictures!) just to show you how wrong you are about this guy.
--- In Booster Gold #1, published in 1986, college quarterback and Gotham University superstar Michael Jon "Booster" Carter is caught in a football match fixing scandal, and he loses his scholarship, resulting in him getting kicked out of the school. He finds a job at the space museum, and then steals a bunch of gear and a time machine, and hops back to the 20th century. During his first romp in the past, he saves President Reagan's life, but instead of calling himself Goldstar (the name that he had come up with for himself), he accidentally fumbled, using his college nickname instead,earning him the alias of Booster Gold.
--- A few years after he began to work out of Metropolis, Booster's sister Michelle came back to the past to congratulate him on becoming a superhero. Initially, Booster was confused, but he then realized that his mother was proud of him becoming a hero. Soon after, Michelle also started operating out of Metropolis as the superhero Goldstar
--- Around that same time, Max Lord started to recruit members of the Justice League International, among them Booster Gold and Blue Beetle.
--- Only a few months later, however, Booster's sister Michelle died, and Booster became a little bit more withdrawn. Eventually, he moved past his sister's death, but then decided that he would be a better hero in her memory.This was around the same time that he nearly died warning people about Doomsday, having been beaten within an inch of his life, before Superman died at Doomsday's hand.
--- It was around this time that Booster Gold would form a fast friendship with Blue Beetle, and they became known as the Abbott and Costello of the Justice League, a pair of practical jokers unrivaled in the DC universe.
--- At that same time, the Justice League International learned that the Royal Flush Gang (who had been taken down by Booster, proving his worthiness as a hero, and qualifying to join the JLI) had actually been hired in order to fake a robbery to make Booster look good. Booster got ejected from the JLI, and then started operating again as a solo hero. (picture pending)
--- It was around this time that Booster began to start taking corporate sponsorships, having even gone so far as to allow people to buy ad space on his coffin (52 Week 18, picture pending) and his uniform, too!
--- A few years passed, and Booster faded into obscurity, only really making minor guest appearances as a gag character, until the series "Formerly Known as the Justice League", where Maxwell Lord tries to reform the JLI under the name of the "Superbuddies", AKA the poor man's superheroes. It wasn't long lasting though, because it seemed like Booster and Beetle had drifted apart, and that drove a wedge into the team.They broke up after six issues.
--- Booster Gold went relatively unused, until Countdown to Infinite Crisis, where his best friend, Blue Beetle, was shot and killed by Maxwell Lord, who was revealed to be a high level telepath, evil scheming jackanape, and an all around not so nice dude.
--- During 52 (which directly followed Infinite Crisis), Booster plunged into a downward spiral of depression where he just became a worse and worse person, and he nearly kills Batman for ignoring Beetle's plea, inadvertently killing Ted Kord. That's how fucked up he is over the loss of his best friend, the one person in the entire century who didn't think he was useless.
--- He attends Ted Kord's funeral, where he feels like shit because he can't even eulogize his best friend. Not so long after, Cyborg calls him a screwup, and Michael blows up on him
--- Some shit happens, Booster and Rip Hunter (a time traveler) go timehopping, and they save the multiverse, on the one condition that Booster gets to go back to the past and undo Infinite Crisis, and save Ted's life
--- Long story short, saving Ted doesn't really work, because it triggers a post-apocalyptic future society where Max Lord took over the world, and OMACs do tons of shit which is really bad. The two of them lead an underground resistance in an alternate timeline to fight a brainwashed Superman and take down Max Lord. It doesn't work,and Ted reckons that he has to die in order to stop the timeline from ever ocurring, so he uses Rip Hunter's chronosphere to travel back to his death and essentially commit suicide in order for Booster to un-die.
--- Booster's pretty salty about all that, but he decides that in order for him to respect Ted's memory, he needs to be a really great hero and stuff, because he's doing Ted an injustice by doing so much shitty stuff. Him and Rip Hunter end up tromping around the multiverse fighting temporal anomalies and saving the past. Eventually, he lets Dick Grayson in on his mission, and they become good friends. Booster realizes that he doesn't need the acceptance of others, that being a hero and respecting Ted's memory is enough for him.
The thing about Booster is that he doesn't have a "traditional" secret identity. His secret identity isn't 'Michael Jon Carter, humble bachelor', his secret identity is 'Booster Gold, the Greatest Hero You've Never Heard Of, Protector of the Timestream, Savior of the Multiverse'. Other people just see "Booster Gold, corporate sellout", because they can't be privy to the shit that he and Rip Hunter get into in the meantime, like hunting across space and time for Batman post-Final Crisis, or making sure that Hal Jordan happens, or saving the Teen Titans from getting murderstomped during the Judas Contract. This is how he spent the last few years before the reboot to N52, where he's basically an entirely new character.
As for Yamcha, he may not be the strongest fighter, but he's always had a heart of gold and his head in the right place. If history of fictional fights teaches anything, it's that power means nothing against the will to do what is right. Something Booster lacks (or rather lacked). I'll give it to you my rounds were overly exaggerated, but I would still place my bet on Yamcha 10/10 times.
Yeah, in hindsight, that whole "Booster lacks the heart of gold" kind of thing seems pretty false, right?
Also the fact that none of Yamcha's attacks would even tickle Booster, the guy is like a brick wall. Except nearly as durable as Superman.
Your criticisms of Booster are about ten years too late, as he hasn't acted like you're describing since around Countdown (which was published in 2005). Booster is, honestly, even more of a hero than Yamcha could ever be, because when Yamcha is outclassed, he backs the hell down. He quit training after the Cell saga, when he was like "welp, this shit's too strong gg afk". When Booster is outclassed, he gives zero fucks, because backing down and acting the coward would be a disservice to the memory of the one person of the 21st century that actually treated him like a real human being, and he's not OK with that.
