So to answer my own question about how the celtics offense is letting the team down:
The C's need to get to the line more often, and Pierce in particular. His game is getting the and 1, and if he's not doing that he's not nearly as good.
Ray Allen needs to make threes. Rondo needs to make layups. Garnett needs to get down in the post instead of taking those outside jumpers. Although KG can make that shot, to me, that's more of a 2nd option instead of something the celtics should consistently look for.
Perkins has been playing good offense, so that rounds out the starters.
For the bench, Eddie needs to stop taking so many stupid, contested shots. He's a spot up 3 point shooter, and he should realize that's his role. Baby.. well, Big Baby just sucks. He sucked last year, and idk why people thought he was anywhere near as good as Powe. Next up, I'd just like to thank god that TA is injured and can't play. He's just like Big Baby... not a good player.
Basically, Powe is the one player off the bench that's been playing good offense. Oh, and Scal has been decent on both ends of the floor, but I never expect much from him anyway.