I have a rule of thumb for anime:
"If it's more than 52 episodes long, it sucks and its stupid."
The only exception I've ever seen to that rule was Rurouni Kenshin, which clocks in at 96 episodes. Which was still too long and it is guilty of some "drawing out." Still good though.
Also, Anime's with less episodes can still be bad.
As for some of the anime's mentioned here, well, I'll start with DBZ. I loved that show when I was younger, but I remember the exact moment I realized the writers were lazy and stupid. It was during the Frieza saga, when Vageta made Krillin hurt him so he could heal, knowing that he would recover twice as powerful. I swear, if I could become as powerful as a god by getting beat up a few times... Not to mention, if he knew that all along, why didn't he just have Nappa beat him up a bunch of times before the series started and shown up at the beginning as powerful as an SS4!? The answer: The writers are retarded.
Bleach... dear god. The first season showed so much potential. Then they blew it and basically just turned it into DBZ. The whole time they were in the Soul Society was like40 episodes. And it all could have been summed up in like... 10, give or take. I stopped watching it after that. It was pretty clear to me that the writers subscribed to the same kind of bullshot that the DBZ writers did.
Inuyasha. I think VGcats said it the best: "It's DBZ for girls!"
Naruto... just shut the *&%@ up! Ninja's are supposed to be STEALTH warriors, not annoying little retards in bright orange track suits that can't talk in any volume lower than f***ing SCREAM. Naruto is the equivalent to a forum troll with CAPS LOCK eternally engaged.
B3LI3\\/3 IT!!11!1!!!!1 ....... I hate Naruto more than anything. Not to mention Sasuke, who's garnered a fanboy following that hasn't been seen since the days of Sephiroth.
/rant