i wouldnt say the clones are weaker.....i think the only real problem of kage bunshin is it distributes the CHAKRA, not the actual strength, but its not so much of a problem for naruto, since he can afford to distribute his large amount of chakra. You guys also point out how kage bunshin shouldnt be defeated so easily, well the power behind kage bunshin isnt in the jutsu itself, but potential that it has. Naruto's not that great at taijutsu, so therefore even if there are 5 of him, both neji and kiba shouldnt have a hard time, cause they are both skilled at taijutsu. Now if someone like rock lee could use kage bunshin....then imagine the damage that would inflict on the gaara match! Another potential use for kage bunshin that would make it really powerful is for ninjutsus......if sasuke was to use kage bunshin, he could have fireballs flying ALL OVER the place (if he had the kinda crazy chakra stamina that naruto has, at least). Since naruto doesnt really have much else in taijutsu or ninjutsu, he has to resort to more creative ways to using the technique.
Its just a shame that he usually attacks blindly until he's lucky enough to discover a weakness in the enemy