My problem with Vince is that he will rarely ever sing the songs. He will hit two or three of the words then skip the next five and then he will let the crowd do all the coruses. If he would actually do his part I would not have any complaints about him. Their shows are always very entertaining. I have seen them on just about every tour they have done and have always liked the show but Vince needs to sing, even if he isn't the best singer in the world he is what people want to hear when they go see Crue.
I really think of the Crue as more of a visual experience band rather than one you would expect to hear serious music from anyway. With them it has always been about the sex, drugs, and rock n roll party. I just take 'em for what they are and never expect anything more. (Except I do expect them to sing the lyrics the way they should be sung)