Sasuke bother's me to the point of no return. He is overly reliant on his curse seal and sharingan and the logic behind his reasoning to do the things he does make no sense.
"I just killed my brother!!!^___^ Oh wait...you mean to tell me that my brother actually loved me? D: Oh damn..well... totally Konoha's fault. I'm gonna get revenge on them mmkthnxbai." Though techinically it is his fault for being that hellbent on revenge.
Also, sage mode IS overpowered. Not that Naruto really needs to use it though, he's the only shinobi in that series that ends every fight with enlightening words.
sage mode is OP but thats because it can only be used for a short time. and it takes time to go into sage mode. he also can only used to a max or 2-3 clones when in sage mode. i think narutos new power since he can control the 9 tails will be even better then sage mode.
And Sage mode is just perpetuating the same logic as DBZ: I am a Super Saiyan, but oh no, someone stronger came along. What shall I do? Super Saiyan 2. But oh no, someone stronger came along. What shall I do? Super Saiyan 3. But oh no....
I agree with above: Naruto was strong enough. He never needed Sage Mode. What would have been really sick is if he learned the teleportation jutsu his dad used instead.