I'll play the devils advocate. We really haven't seen Naruto except for his little bell sparring match with Kakashi. They got the bells really easily. It seems that Naruto hasn't developed mentally. I'd like to see what Jaraiya has taught him. Naruto might hold his own against them.

if(naruto vs itachi){
This is how I see it. If Naruto walks up to Itachi, then goes to kyubi-naruto immediately. Summons the fourth (note: they learned this jutsu from spying on oro and sasuke, they just neglected to bring sasuke back)! The great yellow flash/flicker, or whatever goes straight to work on disembowling Itachi. Naruto then grows chakra admantium claws, throws rasengan fast balls. == Naruto Victory!!!!
}
else
{
Naruto walks up to Itachi and immediately uses kage bunshin. I hope Itachi whops Naruto's head off, because I'm sick and tired of kage bunshin (I'm sure the freaking artist are tired of drawing it too). == Itachi Victory!!!!
}