For the electrics on mine (which are now all gone), the servo was too weak to hold a line, the ESC was browning out under load and the motor burned out in a smokey smelly mess. So technically the motor was the only outright failure but the other two were bad enough that it was worth delving into the spares bin to swap them out.
For the plastics, they've been pretty stout for me so far. The sway bar arms don't bite properly so the grub screw backs out, I've spotted a split on one of the battery box supports (also cross brace the frame which is still kinda wobbly) and I've seen enough folk break the chassis at the trailing arm mount to be half expecting that to pop sometime but it hasn't so far. I've had a Yeti and yes, it's a lot more solid (and scale looking). But the Outlaw drives a hell of a lot nicer imho and parts are cheap so I'm not phased. I've got no alloy bling on it yet and it's holding up surprisingly well. Fairly sure if I took it to the skate park, I'd break it in short order but hey, that's not what I bought it for