I don't know what it is, but typically when someone's obnoxious, they're not really likable. And Alex and Andy are obnoxious. With Andy on Parks and Recreation and even Bright on Everwood is this: That guy who was probably a douche in high school, who may have peaked in high school, what happens to that guy? All three of these characters are guys who probably have their best days behind them. But, with that comes a sense of sort of a learned humility. What makes the characters endearing may be that they're forced to realize that they're not as badass as they used to be. And then if you play the character who's learned that lesson, it's really hard to dislike that person.