It depends what Gamestop you go to. Most of the ones around here have people who are intelligent with video games.
Game Crazy, I can't say because there are only two around here (Selden and Ronkonkoma).
Best Buy is OK, but not the best.
EBGames is pretty good, too, as they have MUCH better trade-in prices than Gamestop.
I've had a bad taste in my mouth from Circuit City, as the $4.99 "promotion", which was actually a clearance, was REALLY shitty, and the employees kept on saying how they would get a shipment in.
Nothing is really heads and shoulders above the rest, though. The worst has to be Toys-R-Us and K-Mart, though. Their prices never go down.