Nope. I've even gone out of my way to announce that I'd roll on anything I'm able to, to pass it off to someone who's pulling their weight if I happen to win. You'd be surprised how many people agree with and support it, especially after looking at the meters and seeing half of the dps barely beating the tank.
What people don't get is, the drop doesn't necessarily have to go to the top performer. Just last night, there was a guy in LFR who had pretty crap gear, but he was playing extremely well and had a great attitude, so a few of us rolled and helped kit him out. He felt bad that we were passing a few pieces off to him, so he gave one of his upgrades to a healer who was undergeared but performing well. Everyone generally had a pretty good time messing around on the bosses, and the only people who really complained were the people who were pulling 8k and not winning their rolls.
Hell, we had a few people even pipe up in /raid asking if anyone had any advice to do better dps. Sure, one or two jerkwads yelled at them, but most of the people in there were generally helpful and offered any advice they could give. It was a nice run.