Taurus PT-111 pro. I hated the trigger slop and take up before it was right at the firing point. Seemed almost an inch long before it got to the firing point.
Tec-22. Cool idea for a gun and it even used 10/22 mags. On the very first trigger pull I got a three-round burst. Then it jammed. Then it went full-auto. Then it jammed. After much ammo experimentation and trying various mags, it finally and fatally failed to fire.