Shadowshot... meh. I personally hate it in PvP.

Golden Gun is great, but there frankly is no replacement for being able to do good twitch shots. If you can't do that you're going to have problems. Practice pulling off rapid twitch shots on enemies in PvE.

Arc Blade is still extremely powerful, it's just everybody and their dog has completely forgotten how to use it it seems. If you pop Arc Blade and run at an enemy from a distance, you're doing it wrong. When you get gunned down, it's not because Arc Blade is weak, it's because you're using it like a dummy. If you're going to make an attack on someone, have a route in mind that makes tons of use of cover and obstacles to rapidly get close. If there is no such route, it's the wrong time and place to be using Arc Blade. Get in a position with a more favorable approach before you pop it.

Also, use Razor's Edge. It's like getting a free multi-use (but narrower) Striker shockwave. I can't tell you how many times I've seen people pull out their shotguns to shotgun-melee combo me and I just fling off a Razor's Edge in their direction and kill them.

Depending on your situation, Hungering Blade isn't the be-all end-all of usage. Stalker + Shadowjack can work extremely well for getting yourself in position without being noticed. Not because of your invisibility (which most people will see through), but because you won't appear on radar. Pop arc blade, crouch immediately, go invisible, and then haul ass along an unexpected approach and launch your attack once in range. You'll catch people off guard a lot. That's actually had better results for me in 3v3 than Hungering Blade if you combine it with a distraction from your team as you approach.