I went with GameStop. Why? The thread asked for Worst B&M Game Retailer. They're the ONLY ones who happen to be based around selling just games.
Most people who vote CC because of the Speedy incident seem to be forgetting that he's said many times before that he COULD get in trouble for it as it's technically not legal to reveal this sort of thing, due to competitors possibly taking advantage of it. Not to mention, it was mostly SONY who forced CC to go find Speedy because of the revealed "price drop" on the PS3.
I'm not voting for any of the other stores. They don't specialize in gaming. GameStop does and they've proven to get worse every year.
-Gutting new games
-Raising the prices of used games (Dance Dance Revolution Mario Mix is $70 USED without a pad)
-Charging full price for incomplete used games
-Terrible customer service
-Terrible trade-in values
-Constantly trying to get a pre-order or Game Informer subscription out of you
-Buying out and killing off all forms of competition, leaving little room for variety in games to purchase (BAD for retro gamers)
-Only orders enough games to fill in for amount of pre-orders along with at least two extras, while having their employees tell you that you will NEVER find said games elsewhere, despite said stores generally having way more than enough
For a store that supposed to give "Power to the Players" and is meant to cater soley to video gamers, I am utterly disgusted with how they can't seem to get their shit in order.