Extractor issues too, not just on Gen4's, late production Gen3's also. Yes, the problems are very real, however some Glock loyalists will insist it's inferior ammo and inexperienced shooters. Both have their part, yet previously Glocks functioned fine regardless, now not so much.
ETA, just saw this in another thread:
http://pistol-forum.com/showthread.p...Extractor-Woes