We don't have Gamestops over here but I don't think I've ever heard a positive story about them. Sound like an odious company.
I haven't had a major problem with their actual corporate policy since they (seemingly) stopped making pushing used games over new game sales their SOP. I fully recognize that the employees I've had problems with - the ones who seem to be pushing an "internet forum" type agenda rather than just doing their job - are individuals acting on an individual basis, and not really a reflection of the hiring practices.
That said, they could probably do a better job of reigning them in. The first time one of your employees tries to talk someone out of buying something, you sit them down and explain to them that they are a retail clerk and not a life coach. I don't care if a 50 year old man comes in asking for Barbie's Horse Adventure, you don't try to talk someone
out of a sale no matter how poor a fit it seems; not only is it the exact opposite of your job, it's actually quite rude, as you're basically patronizing the person.
I mean, I've never had someone try to talk me out of buying a fighting game, but I've certainly had clerks try to talk me out of buying things I explicitly came in to buy (a Wii-U, Bayonetta 2, etc.) on the basis that I
obviously don't want the system Call of Duty won't even release on/a game with a girl protagonist/"baby stuff"/etc.