Since the best has been already asked, I figure why not the worst! Well let me kick things off:

Paranoia Agent, didn't make any sence

Boogiepop Phantom, just awful

D.N. Angel, I've watch 5 episodes and it really annoys the hell out of me!

Darkside Blues, just all around stupid

When They Cry- didn't make a bit of sence. Not only that I keep seeing saying you gotta watch the sequel to understand what's going on. Well what's purpose of When They Cry and please stop comparing this to Elfen Lied please!

Now I'm just curious to see what everyone else think.

i think id have to go with sailor moon but i actually didnt mind that show

Yeah sailor moon sucked
let see
Pokemon [I was a Pokemon manic until they killed the show and got to repetitive]
Bey Blade [even though i watched a few episodes]
Yu-gi-oh got gay after first season

i know more but i can't seem to find the names

Sailor Moon is pretty bad, Pokemon's ok but I always thought Digimon was better anyway. Another show that got on my nerves now I think about it was that Bo Bo Bo crap or whatever it's called, that was pretty stupid too!

thanks to fuken sailor moon i developed a skirt fetish now every girl i date i ask em to plz wear a skirt and damn dat gets me going lulz.
And come on guys it wasnt that bad i rly enjoyed the drama and was introduced to sailor moon by my cuzin btw
Higurashi is one of those animes you actually need a brain cell to watch is a creepy master piece with an extreme mixture between cuteness and gore.
and yesh i agree with you T G but i kind of also understand why would they compare them. i mean look at the similarities higurashi or when they cry and elfen lied. they both depict extreme cuteness and then depict extreme gore and death in the same episode
anyway for my worst anime i will have to say i was Star Ocean. It became the first anime that bore the shit out of me.
for my best animes they go as followoing

Pokemon << yesh it got old but its a perfect classic
School days<< reminds me bout all the dramas in my old HS
Elfen Lied <<< i love Nana
Higurashi no haku koroni (when the cicadas cry)<<< its creepiness cuteness captivated me
The melancholy of haruhi suzumiya<< ill be dammed but that girl hmmmm theres something that makes that anime great
cant really tell
Lucky star <<< random shi makes it hillarious
Bokuratsu dokuro chan<<< fuken funny sh1t
Full Metal Alchemist<<< nice action serie unlike all that bleach bullshit
Hellsing/Ultimate damn theyre the shit
Gankoutsou <<, best animation ever
i rly recomend them
animes that have failed for my taste
Death Note
Doremon
Let me know wzup k later

Sailor Moon Was quite good i think...

Uhmm Pokemon...Too many of them...got boring...

DNAngel you were right

This Ugly Yet Beautiful World...oh god...

and Uhmmm Strawberry Panic...more of the guys show...Lesbians having sex..*sarcastically* Such a good story line...

uhh...Please Teacher....Please Twins was better

uhmm and uhhmm Girls Bravo...the girls have to be pretty if its going to contain nudity...Im Mixed btw

And uhmm yeah that's all i can think of atm

Higurashi's a masterpiece? How can it be a masterpiece when it don't make sense? It don't take 1/2 of a brain cell to get that. I will admit that it does leave certain clues and yet despite that, you still have to watch Higurashi No Naku Koro Ni Kai to put everything together. So why waste time When They Cry when again you have to watch Ni Kai to unstand everything? it's like watching Saw II to find out what happened in Saw I. In terms of Violence, with Elfen Lied you see what's going on unlike Higurashi which strays away from the violent scenes.

Another thing not related to Higurashi or Elfen, when it comes to Please Teacher and Please Twins, Please Teacher was way better than Please Twins! The best thing about Please Twins was the Ova. This Ugly Yet Beautiful World was pretty good too.

idk if I don't like the pic and desciption, I don't even bother....but I can use some advice...I'm runnin out of some to watch...on youtube I'm watching sister princess...but it's gurlly, but I need sumthing happy to wash away the sad ending of chrono crusade

So are you looking for some chick Anime or what?

not really...just wachin anything...I'v got an open mind about the different animes I watch. I miss some action though ( more D. Grey man, Naruto and Code Geass)

air gear's ending sucked not the anime itself.

escaflone it isnt the worst but it is one of them puni puni poemy get the girl a gag .hack gift, bleach sealed sword frenzy and memories in the rain, devil may cry, kiba, getbackers the way it ended just pissed me off, spirited away, darkside blues, rave master is another one that was really bad the main character was always crying and whining about what his sister taught him

ill name the worst anime's that i watched based on the expectations i had for it only to let me down on so many levels
Worst 5 (in no perticular order)

Samurai 7 - boring and crappy fight scenes; i cant believe such a crappy samurai anime exists

Lunar Legend Tsukihime - doesn't make any since and couldn't believe Typemoon allowed this anime to fail so horribly.

Samurai Deeper Kyo - All the Demons are killed the same way and you gatta hear that annoying guys voice doing yell out all his moves the same way you had to listen to all the Sailor Moon girls do there interpretive dance and yell out there stupid attack (granted at least Sailor Moon had a decent story)

Mushishi- OMGsh soo much talking and no story *seriously there is no story it changes every episode no joking all true

Requiem of the Darkness - For the same reason i dont like mushishi this anime has no story and is boring

WEDDING PEACH!!!!!!!!! It's worse than Sailor Moon.

EEEEEEEW!!!! WEDDING PEACH! I forgot all about that piece of shit! Fuck Wedding Peach!

IDK i started kurokami but I just can't finish it...lost interest its just bla bla bla!! and its like a knock off of Fate Stay night kinda.