I don't think it's necessarily the actual winner that has people talking, so much as how it came to be that way, for two reasons.
Reason 1) 3 of the 5 participants picked game A as their Game of the Year. 2 of the 5 picked game B. Game B wins.
Reason 2) Brad has the most obnoxious method of "debate" among the Giant Bomb crew. Sorry Brad, I like you most of the time, but every year on these game of the Year discussions, at least one, and usually several categories come down to Brad digging in his heels, sticking his fingers in his ears and refusing to concede any point while the others are able to separate themselves from the fray and actually consider both sides.
In addition, he has a tendency to throw out nonsense argument after nonsense argument, knowing that if he throws out 4 of them and the others immediately reject one, that the other 3 usually go unckecked.