The "problem" with pitbulls is not so much the pitbulls themselves, but the fact that humans have bred them to be fight/aggressive, so they can be by nature if not trained right. Some things may also trigger an otherwise calm dog. If you raise one properly I'd say it's probably fine but because of their potential aggressive nature (again, human's fault) you still need to tread lightly with them, don't jump in someone's yard that has a pit bull and expect it not to try to protect the yard, for example.
They are banned here, which I think is BS, because when they impliment these laws, in lot of cases owners are forced to get rid of their existing pets. Here I don't think it was like that and they were "grandfathered", but in some places it is.
I think if they really feel a breed is dangerous they should simply ban breeding them. Eventually there just won't be much left of that particular breed.