His a chuunin lvl with 1 S rank tech
The guy is slow,ave tai, no gen, and only 1 element how can he be jounin level in base.
I am sorry to tell you but with after training with Jiraiya in Taijutsu and training with Frog Kata his Taijutsu skills are really good (not like Lee but awesome none the less in base mode).
His speed has picked up quite a bit as well especially after he clashed with Sasuke. Naruto is becoming very very fast. Plus we haven't seen Base Naruto oin I don't know how long so how could we really base what level he is at when he has been in Kyubi/Biju Mode for most of the war.
PLUS he is the only one in the series to use a Kage Level technique Kage Bushin no jutsu and at an expert level as well. He could make an army of himself and learn super hard techniques in a matter of days or weeks.
PLUS yea you say that he has:
1. The Rasengan which anyone here cannot admit that it is a very powerful technique, especially with its many variants
2. Wind Rasengan
3. Rasenshuriken which by far besides Kirin is the fastest long range attack I have seen. Also if it hit you, you are a goner or you would atleast never use any chakra attacks ever again.
PLUS he can summon any and all of the frogs who are also powerful.
PLUS his heads up strategy skills are amazing compared to many who have to think on their feet, not all but many.
PLUS his chakra reserves are 4 times that of Kakashi's so he would be able to l ast much longer in a fight if he uses his techniques correctly. Even though I doubt he would be able to use his chakra more effectively than Kakashi who knows 1000 techniques.
Yes his base mode is not all that but all the Kage Level techniques that he knows (which by the way are very very powerful) he has learn them & are using them like a Kage Level Shinobi..