While the playoff experience he brings is certainly a plus, it becomes even more valuable since that experience came playing alongside Carmelo Anthony.
Although Smith is certainly cuckoo, it is likely that things won't get any crazier than his new questionable haircut, as team leaders like Tyson Chandler and Amar'e Stoudemire should keep him in check.
Smith's biggest asset come playoff time will be his ability to knock down clutch shots, as he can catch fire at any time and can carry an offense when he heats up.
However, just as John Starks did so many times for Knicks teams of yesteryear, Smith also has the ability to shoot his teams out of games as well.
Especially since he will be playing for Mike D'Antoni, who encourages a hefty number of three-point shooting, Smith will have to learn during the regular season to have good shot selection, as the Knicks cannot afford to lose playoff games due to moronic shot-taking from the crazed Smith.
All that being said, it is likely that he will have a positive impact on the team come playoff time since he will have Anthony, Stoudemire and Lin to take the pressure off him so he doesn't feel like he has to carry the scoring load if his shots aren't connecting.