Extractors broke often, if dropped on a hard surface the slide will often depart the frame, they had a bad tendency to go click instead of bang, they also had a tendency to occasionally fire out of battery.
Huh. None of my Gen 1s have ever done any of this. Most of them I bought used, so I don't really know what's been done to them, but one I bought new, and have never done anything to it but shoot it and clean it.