You've got some interesting points, Superman, but you must remember that it was a cooperative effort of both Naruto and Gama, they would both have lost fighting individually. Gamabunta was the one that explained the way Gaara was the medium and had to be awoken, etc .. and the one who explained the need for the henge, and also supplied most of the muscle for the battle.
Naruto by himself would have been totally destroyed by Shukaku, for that matter even Jounin-class ninja would probably have a hard time surviving the encounter unless they could summon something to match shukaku in size/speed/range/defense/offense. Shukaku seemed to be even slightly more powerful than Gamabunta, he was at his limit when Naruto finally knocked Gaara the fuqq out [img]i/expressions/face-icon-small-smile.gif[/img]
Edit : OT, I think that Naruto certainly has some Jounin-level capabilities, but isn't worthy of that rank yet, and probably for some time.
My take on Naruto's abilities :
Physical Strength : Chuunin level
Chakra Strength : Jounin level
Taijutsu Ability : Genin level
Genjutsu Ability : Genin level
Ninjutsu Ability : Chuunin+ level
Tactics Ability : Chuunin level
Command intellect : -Genin level
Strength of will and heart Ability : Hokage level