You've also got to consider what kind of role we are asking Marbury to play. We aren't asking him to carry the team. The Big 3 hierarchy is already in place. Marbury is not the top dog coming into this team, he is a roleplayer asked to be a 6th man and 2nd PG. If you ask me, this takes a lot of pressure OFF Marbury's shoulders, and might allow him to play even better than when he was expected to carry a team.
He's got all the talent that you'd want in a baller, he just has to be on good behavior. When you are winning games, things tend to go smoothly. He's not being thrown onto a losing team and asked to 'save' the team. He just needs to play his role. I think Marbury can do that much. If he just learns his role and sticks to it, by the end of the season, I bet he will soon become a fan favorite.