I would say, basically, keep him if he's fun to play. Or if you think he still could be.

And by that I mean just fun to play -- not necessarily to give plots, or even to build friendships, but to just throw him at people and see what they make of him. Let him ogle women, let him be a jerk, let him offend characters, and see when he surprises you by being liked after all, or ogled back, or offered a drink by somebody equally rough-edged.

I don't have a big impression of him, because I've only seen a few threads of his. I remember really liking at least one of his threads with Moiraine, though. (And emailing Aspen to say "AHAHA he really should meet Lan sometime," although at that point it was kind of impossible as I hadn't yet brought Lan in.)

I have no idea how well most of my characters would like him. I'm entirely willing to find out, though. :)