Well, I like that Brian is one of the most intelligent characters in the show, he’s quite articulate, and when the Griffins are in a bad situation, not only does he show common sense, but sometimes he cares for his family. Even right before he dies, which was temporary, he says “You've given me a wonderful life. I love you all.”
Plus, he was born in Texas. I can’t ignore that, if he's Texan, that’s fine with me!