Deuce, there was an article on tennisone.com after last year's IW from the ballkids coordinator that someone posted here (it wasn't me). The author of the essay mentioned Tim as rude, Tommy as foul-mouthed (duh) and Kim and Roger as wonderful, or something like that. I wonder if that's still lurking around here since it was on the old board...
I find this thread very interesting. Not sure if we are talking about on-court behavior, off-court behavior, or both. In my experience, every player is human, which means they are nice and accomodating sometimes, and cranky and oblivious other times. But for some reason, I just have to laugh when I see glowing reports of Tommy Haas. I swear, I'm very fond of the guy based on my experiences with him in the past year, but he was flat out rude to me in LA last summer (and I was not pleased, it's not like I'm a complete stranger to him) and then he was just adorable in San Jose. He always seemed to be in a hurry in IW this year, but he tried to take a few photos and sign a few things for people as he went along his way. He can be very charming when he wants to (usually when there are pretty blondes nearby). I've seen Marat rude, and nice; Andy sign everything in sight with his own sharpie marker, and running away from fans to get back to the players' lounge; Guga interrupt his own breakfast to sign and take photos, then later in the day have an escort so he can avoid the crowds. I think it all just depends on the player's mood, and their schedule and obligations at the time. I can't think of anyone that I've ever heard of who is consistently horrible to people.