GQ Magazine just came out with a list of the fifteen "worst" sports fans in America, and they rank Maryland's basketball fans fifth. I agree with Dan Steinberg at D.C. Sports Bog when he says that the Terps probably ranked this highly because of a reputation that might not still apply, but that they probably aren't going to be able to outrun.
The only piece of evidence GQ uses to admonish the Terps' fans is the riots they have taken part in over the years. It might be the most recognizable aspect (dare I say tradition) of the Maryland basketball fans, but I don't think it is what defines them.
The thing about Maryland Basketball fans is that they will be proud of this distinction, and would probably wish that they could be ranked a little bit higher. Their goal is to get into the head of everyone who isn't wearing red, fans included, and they don't care how they do it. It is understandable that there are people around the Country who don't like them. That just means they are doing their job.
I will admit, there is no excuse for the rioting. That is unnecessary, and it really does make the Terps fans look bad. But if you were to judge them solely on their performance in the Comcast Center (maybe not this year) they would have to be considered among the best; even if that means being called the "worst."