As much as I don't like him, one of my favs is Moriarty. Because unlike the rest of the wasteland, he doesn't give out all the info on your dad as if he cares, everyone else does that and it svcks.
The thing I like about Moriarty is when I asked him about Galaxy News Radio and he says "Three Dog keeps yappin about "Fighting some Good Fight", a bunch of crap. But if you want to find out what's going on in the Wasteland that's the place to be, me I could care less".
Seems to me like Moriarty is a cynic who either doesn't believe or doesn't care that there's good and evil in the Wasteland. He's just looking out for himself and trying to make his life more easier. He doesn't care if people like him or not, after all he's got plenty of dirt on many of Megaton's "finest" residence. So it's like if they think he's bad for being a pimp and a slave master, he can find something just as bad about them that their family and friends probably wouldn't be too happy about.
That makes him cool in my book, he doesn't take crap from anyone. B)