Kyuubi: Why can't it just help for once?
We're constantly seeing a mixture of good and bad things from this fox. It's like everytime Naruto takes a step forward and gets more power, some problem with the fox hurts him again.
First, he had all that fox chakra but he couldn't control it because it was based in his emotions. In later forms when he turned too much into the fox he couldn't control it at all, and the fox started to hurt his friends.
Then when he entered his 2-tailed and higher fox modes, it was eating his flesh causing his life to get shorter.
The fox prevented him from merging with the frog sages to perfect his sage mode, so he has to set up clones and still has a limited amount of time with it (plus he has to have a summoning scroll, which is difficult for himself to use during battle).
Now he finally has full control over the fox chakra, but can't use his signature multiple shadow clones technique with it (which he has spent most of his life training to perfect and use in battle), he can't do a full beast transformation either. Also, the fox is such a jerk that he won't negotiate chakra exchange.
Without all this, is there any way for Naruto to get more powerful? A new fox-ball rasengan or whatever is nice, but if Naruto can't use shadow-clones to set up the attack like he has always done, it's worthless. Even if he doesn't need clones to make the rasengan, he always has used clones, or relied on allies, to deliver them:
With Pain, he used rasengans and rasenshuriken several times using clones and smokebombs as decoys. The last hit in the battle, he used clones to trigger the Shinra Tensei, and then used clones to throw himself at Pain to cover the distance.
With Kakuzu he used clones to set up a series of diversions so he could land the wind-rasengan.
With the Itachi clone corpse, Kakashi used himself and a clone to distract Itachi so Naruto could hit him with Odama Rasengan.
Actually, now that I think about it he didn't use a clone the very first time when he used the Rasengan against Kabuto. Also, he doesn't use clones whenever he and Sasuke do Rasengan vs Chidori. Of course, Naruto never seems like he's trying to win those battles either. Otherwise every time he uses Rasengan he needs a clone to set up a distraction.
With this new fox power, every strategy he's ever used is now unusable.
Will Naruto ever be as powerful as Killer Bee? He can't do full beast transform and can't negotiate chakra transfers. Maybe, MAYBE there is a way for him to use Sage chakra to help protect himself from the fox draining his chakra away, but that seems like a long-shot to me. It would be funny seeing the fox turn into a big frog statue though.
It annoys me that everybody else is getting super powerups, but Naruto is still held back by the fox. Can you imagine how powerful he would be if the Fox were a little bit more friendly?