Artest has had 1 good game all series, and it was game 6. Pierce can score on him.
KG has had a few good games and is shooting a good percentage. With Perk out they may mix up the match ups, not sure how that will work.
Ray had a few bad games, but he's the best pure shooter in the NBA.
Even without Perkins, the Celtics bench is still much better.
Rondo has been missing lay ups, that's easily corrected by just getting the lucky bounces (that Boston has not seemed to get all series), the rest of his game is solid.