The reason is because of the way he obtained his powers.
Sandal hat made his body forcefully obtain the powers and he nearly turned into a hollow remember?
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well im on episode 74 of the series now, and it has definitely improved. sadly when things started to get good they had to ruin it with DBZ crap, for example:(warning might be spoiler)takes someone 10 years to release a bankai and this asshole did it in 3 days, he beats a LT and barely survives then fights a captain the next day and wins, then he easily stops that over sized spear that apparently has the power of 1,000,000soul slayers but still is only equally matched with the 6th captain, wtf?
to sum it up:
-the dialog is funny, but very corny.
-very good storyline, but they approached it the wrong way
-the fighting sucks
-the characters contradict quite a bit
in all, i like naruto alot better then bleach, i definitively kept an open mind when watching this anime, and it just wasnt my cup of tea.
-Chicken
They were pretty good fillers lol