I've known a few...
Generaly, I feel that most pilots are decent, caring human beings. Like other professions, you run into a few that tarnish the reputations of everyone in that field.
I look for qualities that include that pilots take their job very seriously, as I do mine. The flip side to that is that there are those few who take themselves very seriously, and they are just a PITA to deal with. One G550 pilot I know only calls when he can't fix the problem, and by then I have to go and undo what he did and then resolve the issue. Obviously, he doesn't take his job too seriously otherwise he'd know that, in his position, he's limited to light preventive maintenance issues. Kind'a scary to sign the tech log because I don't know about anything else he might have done.
There is a difference between the professional pilot and the prima dona pilot. If you have worked long enough in aviation, you will know that.
Cheers.