There are a few things that bother me.
Why is it that women in some animes ALL have FF breasts? Look at Bleach. Orihime, Rangiku, Kûkaku, Nel as an adult, and Harribel (3rd Espada) all have oversized breasts. Just off the top of my head. True, there are a lot of other female characters that don't, Rukia for example, but these are a lot of major characters that have oversized breasts! Why? It was unnecessary.
How some things are drawn out. Once more, in Bleach, when Ichigo first uses his Bankai, it takes like 5 minutes for him to actually do it. There was a ridiculous "Power Up" time in there. In the manga, he said something to the effect of "I'm gonna use my Bankai" and two pages later he had used his Bankai. No long exposition. Just done. I actually wonder if the DBZ manga has this problem as well.
More than all other things though. FILLER! FILLER! FILLER HELL! Oh my God, the filler! I hate filler. Naruto had some of the worst ever. It was just "monster of the week" type stories. It never made sense. Just an excuse to make Naruto and these random ninja team up for some reason. There were like 200 episodes of filler. Bleach had two seasons worth with the Bount, but at least it had a single story.
Yeah, I know I'm mentioning Bleach and Naruto alot in this post, but seriously, they are bad offenders of that and everyone knows them.