Kabuto is not lame. There's still some mystery to him. For instance, his power level. Sure, it's been said a couple of times that he's about as strong as kakashi, but I'd like to see that for myself. Second, some of the things Orochimaru said to him are still unexplained, like "If you want to stop me you better kill Sasuke." Why would Orochimaru say that? He doesn't come across as the type who talks just to hear his own voice. Also, yes...why bother healing hinata? The answer to all those questions would be nice, and the fact that they're not answered gives him an aura of mystery.