Without kurama, base naruto instantly has reduced chakra.
Say goodbye to 1000 shadow clone jutsu right off the bat.
He wouldn't be able to learn rasengan as easy as he did because he wouldn't have kyuubi restoring him as fast anymore. He was only able to learn alot of his stuff because of kyuubi increasing the rate he recovers and boosting his massive chakra.
Without kyuubi, he would have died against haku. He and sasuke both.
No it's been stated that naruto's chakra control and to an extent his chakra would have been better without it holding back kurama. Naruto without kurama would still be capable of rasenshuriken and sage mode( to a better extent as he would be able to fuse with frogs).
It was only because of kyuubi he was able to learn rasenshuuriken. Without the massive chakra to allow him to use thousand clones, he wouldn't have learnt the jutsu that quickly. He wouldn't even be able to use that many clones that long, and when he dismissed them, he wouldn't recover from the damage as fast.
Alot of the things naruto has/learnt (rasengan, rasenshuriken, multiple shadow clones) was because of the kyuubi increasing his regeneration rate so he could train harder and longer. Without kyuubi, it's doubtful he'd be kage level. All he'd really have is rasengan, summoning and probably max 10 clones to use per fight. With his stupidity, that's not near enough clones. Quite possibly he could have had sage mode also. But that really would only allow him to use odama rasengan and frog kumite. he'd not have a massive array as jiraiya.