I really hate Marbury, but he's a talent we can use. Although I'd hate for him to form part of this team, I think it would be a great move for the Celtics once all things are considered. I think the whole troublemaking bit is overworrying a bit in my opinion (even though it is a legit concern). We have too many determined people in the team, bigger stars than he is. He's not the face of the franchise, so wether he is disgruntled or not won't affect the team much.
But he really is a talent, and having someone like him on the bench can really cause some damage. I liked what I saw from him during the preseason, and before the troubles started this season I really saw some determination from his part to really try make things work. But it all went to hell. He looked in good shape, was playing well, etc.