I've watched Aussie Rules Football, with & without crowd noise.

The crowd noise was pretty realistic most of the time, but at key points it was obviously fake, and therefore became annoying...although only mildly so. I think I'd rather watch without constant buzz of fake crowd noise, but it doesn't matter as much as I thought it would. It is also interesting to hear the players talking and yelling at each other during the game (when there is no crowd noise).