The grossest Gamestop I have been in was when I was subbing for one. They just had empty cases every where, and it was right after Eb/GS merged. I got there in the morning and probably cleaned for two or three hours before anyone even walked into the store. I can't say there were roaches, but it was pretty awful.
Anyway, went and got my last batch of guides yesterday and I don't think I'm going to be grabbing anymore unless this is still going on next week and I end up in the last GS relatively close to me. Either way, I got Dragon's Dogma(planning on getting into it this week), SCV, and FFXIII for ~19. So I'm pretty pleased with that.