The thing is, I totally understand - I'm a gamer, too! I don't even think they're being that loud - it just happens to be that the TV is just under the window in that room, and the window is wide open during the winter. If they moved the tele, problem would be solved. Then again, it might not be as cool of a gaming room.
If I went to a different room, I'd have problems with the neighbors to the back, who aren't playing games, but are in the backyard fighting. The thing that sucks about summer months is that people tend to take their problems outside, because... you know... it's so nice out.