Offensively he's been bad so far, especially in the post. He's not shooting a good percentage in the post at all. There are two big reasons for this:
1) Inability to get good post position/backdown defenders - Tim was never a bruiser, but he had such strong legs that he'd just pin his guy about 2 feet from the basket, catch, and score. Tendinitis has robbed him of that ability to do that consistently. I have a feeling he's going through the motions because he knows that not doing so will result in pain/more wear and tear on his knees. If he's shooting like this come March, then it's time to panic, but for now it's no big deal.