Naruto is as powerful as a jounin.
Not as powerful as the elite 4 (Gai, Kakashi, the woman and Asuma)
But he seems as powerful as Anko, Hayate and some of the ANBU.
I mean come on, who can really beat the sand badger besides Naruto and the more powerful jounins?
Granted Naruto won because he summoned the toad boss, but the summoning itself takes skill and tons of chakra as well. And from the anime, it seems to be that he used his OWN chakra to summon the toad.
Now not to mention the fact that Naruto taught himself a jounin level skill (kage bushin) in a day, and beat the crap out of a chunnin while he was an academy student.
People call Naruto stupid. But he's really bright. He may not be a good group leader, but he comes up with brilliant tactics during the heat of battle.