I may have grown up with Kyle Rayner, but Guy is *my* GL. Though he seems to be only an immature jock, there's a depth to him that's not present in the other earth Green Lanterns. You only have to read about his relationship with his older brother, his personality pre-coma, and the roots of the rivalry with Hal to understand this. Part of the reason why I ship Guy/Tora so hard is that unlike many others, Tora actually tries to connect with that side of Guy.
Confession time: that immature jock side I mentioned earlier? I'm also one of those women who happen to like assholes :P