I've not had controllers shit on me, bar the L-joy stick hitting the fan. And I play pretty long and often. My issue with my last controller was : hold the L2 button and character would move left in a walk motion - in any game - but not all the time. (that's an issue with the webbing motherboard thing inside, not pictured above). The other issue it had was the D pad somehow wore out so it just would constantly go up repeatedly and would mess up targets and you couldn't make it stop doing it. Took it apart and cleaned that one, didn't fix it, so I just tossed it and bought a new controller (could've kept it I now realize but oh well, I'd have to have bought 2 things to fix it). this controller's issue was the D pad again, but not the L2 button, which is an easier fix. It's, if unlucky, the membrain like the L2 issue, and if lucky: it's the rubber contacts. Luckily it was teh rubber contacts. Underneath the D-pad's hard plastic is 4 individual contacts inside a rubber casing that's puffed up kind of like 4 lil wee cupcakes. the problem comes where the cupcake attaches to the plate of the rubber can be worn out, and likely is thinner there, and it'll break away and tear. This causes the contact to send messages to other parts of the D pad and causes the D pad as a whole to feel.. squishy and like the hitting the button doesn't push it down. (interesting design note, the D pad is a single piece of plastic, where the X O and such buttons are individual buttons. if it were me, i'd make the D pad individual too since it can see just as much wear-and-tear as the other buttons but WHAT DO I KNOW)
As a whole, apparently this gen's game controllers are just made like utter shit. Past gen too, PS3 and such, unless you had the OG controllers that were released with the console. That's one reason I'm sad I got rid of my older Ps4 controller, is it was made of overall better plastic. ie; tearing this one apart, I dented bits of the edging to open it, where the other controller when i took it apart, that didn't happen because denser plastic.