There was no "internet hysteria"- at one point a lot of the Gen4s were seriously
****ed up. I know I had 2 of them that were that way.
My G17 Gen4 was a pain in the ass (stovepipes, brass off forehead every other shot) until I sent it to Glock. They fixed it and it has been perfect, couldn't ask for a better pistol. Now it runs great. The G21Gen4 that I had was a POS and Glock had to send me a new gun. When it came back it was fixed, so I can't complain about that. The G26Gen4 I have is the only one that has been flawless out of the 3 , but that would make sense as the design changed the least there.
My experiences would not deter me from buying another one, but anyone who says that the Gen4s didn't have serious problems when they were introduced is being a little ignorant of history.
-Mike