Mmm.. let's see:
DBZ: Hasn't aged well. I have re-watched a couple of episodes recently and discovered that some things that didn't bother me back then, annoy me now. For example, how everybody just stand still waiting for their opponents to finish whatever transformation they are doing.
Naruto: Way too many filler episodes. Like, waaaaaay too many. And let's not even talk about the flashbacks.But still, I still loved it until the Kage's summit arc. After that it went downhill for me. The whole "we thought this character was the leader but he was being manipulated by this other character, and him by this other, and him by this other, etc etc etc. just didn't do it for me.
And the whole "out of space evil" was just too much for me as well in a story that was supposed to be about Ninjas.
Neddless to say, I dropped it at the moment of Madara's "resolution". That was the breaking point for me.
One Piece: I have been enjoying it so far but one thing that annoys me to no end is how overly dramatic this anime is. Like, there is a fine line between Drama and Melodrama and One Piece crossess that line.
I hate how EVERYBODY cries in this anime. And they cry over the most simple little things. And when they cry over something that is remotely important then they go on and on and on about it. Like, dude, I get that you're sad about this boat, but it's being 20 minutes already! cant we just move on with the story?
I still remember this one episode where there was this dude who didn't know how to cook beans properly. Then Sanji showed up and taught him how to do it. And then he was crying, and there was dramatic-epic music in the background, and there were flashbacks, and there was more crying.
And I was like, "wait, are they really trying to make me feel something over a dude learning how to cook beans?"
Anyways, I will go with DBZ because I think its flaws were overshadowed by the thrill it gave me every single week.