I really don't like those 3x5 or 5x5 routines.. I don't really believe them.. This is what I got about them from one very very experienced redditor, I hope he won't mind I post it here:
I think they are garbage because they are focused on one thing: increasing your maxes as fast as possible. It can be good if you have spent months doing only hypertrophy training, because it helps you leverage the muscle tissue you have created, but it's terrible for beginners for multiple reasons:
It is based on a fake sense of minimalism. The heart of SS, SL, Texas Method, etc. is "why do more if you can progress with less", with no regards for the simple fact that the superfluous volume (what you did but didn't have to do to progress) isn't thrown away. The muscle mass doesn't disappear or become less functional because you are progressing slower, it just accumulates and means that a few months down the line, when the weights get really heavy, it will be used, while someone who just stayed on starting strength or other dipshit programs will wonder why their chicken legs can't sustain a 3 plates squat, and then have to do hypertrophy work anyway. Doing hypertrophy work is like doing your homework: you can do a bit everyday or you can leave it to the last minute when you have no other choice, but in the end everybody has to do it. Barbells aren't moved by magic.
It encourages a wrong mindset of wanting to progress as fast as possible. Who gives a shit whether you squat 315 in 3 months or in 1 year? It doesn't make a difference, you will have to slow down eventually or any idiot would be squatting world records in 12 months, and if you are used to putting weight on the bar all the time it will lead to either frustration (if you do slow down) or injuries. Not to mention the fact that doing so little, and less over time, and adding weights as soon as possible is inevitably going to lead to a shitty, shitty lifting technique, and then to injuries. That's why you have the idiots on /r/fitness advising less and less volume: from 5x5 do 3x5, then 3x3, then 1x5, as if doing less is going to yield magical results.
It isn't made for the wide public. Starting Strength and co are based on Starr's 5x5, which was a training system used for athletes. And it worked. Why? Because they are athletes. They already have a substantial muscle mass which they have created through years of playing football and doing random drills and shit. Who doesn't have that muscle mass? Most beginners and the average nerd browsing /r/fitness looking to get buff.
Now these programs have a place for athletes or people with lifting experience, but not with rank beginners who have never seen a barbell in their life. For example it can have a place as a strength phase inbetween 2 hypertrophy phase and that's the best way to use them imho.