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Definitely Death Note. I'm not going to go as far as 'the best series ever' though it did entertained me greatly. I've first found this through a Naruto/anime fanforum and I probably didn't like the fangirls spazzing about how great Death Note is. My view of Death Note was 'overrated' without actually watching it. I was a Narutard back then... Then a few years later (and after discovering this great site), I found its entry here in MAL. I had YouTube on my hands, so I decided to watch it. From the start, I loved it. I rated it a 9 for a while because of its halfway point and the suckish new characters. I recently changed its rating to an 8 because its ending sucked... I think I didn't count endings that much back then.

That's pretty much the only series that make me think This anime sucks but after watching it, I loved it, though.

definitely FMA and Scryed, I usually hate shounen with a passion but those were awesome!

spice and wolf- I thought it would be another cliched "normal everyday dude meets gorgeous and magically endowed chick who only has eyes for him" anime but it was so much more than that :)

chrono crusade- I thought it would be too 'cutesie' but it was actually quite good and pretty serious towards the end

zeta gundam- never thought I would like a mecha anime from the 80s but it was great!

death note
the melancholy of haruhi suzumiya
angel beats

Neon Genesis Evangelion

at first i was like "old school sucks boo-hoo" but yeah after some episodes, i realized it was classic and like no other, its a genre on its own

Welcome to NHK!

well, idk wtf its about, i didnt now wtf is NEET back then...and i was clueless. i was like whatever, then.... bam! episode 1 got me into it, then it was so awesome i finished it in 4 days!!!!!!!!! somehow i relate to it somehow cuz its how i feel back then, alone & hopeless.... but im different now, because this anime showed me how it was like & how to get over it.

B Gata H Kei
Definitely not one of the best things I've ever seen, but I freaking loved it.

Nana, TTGL, P&SWG

Not gonna call it one of the best series ever, but I was surprised that I ended up liking Strike Witches.

Mahou Shoujo Madoka Magica

biggest surprise of the year

Code Geass, from thge synopsis I didnt think I'd really like i, but I ended up marathoning both seasons and loving it. Most recently would be Mahou Shoujo Madoka Magica, thought it'd be just another Mahou shoujo anime. I was wrong

Clannad

gundam seed - I never watched any mecha anime before this anime and after I watched it, I'm addicted to all gundam series...

gintama- This one really made me hard to breath because I laughed a lot..haha

cowboy bebop- I love the storyline..different type of cowboy..hehe

princess tutu - my first dark fairytale with wonderful ending..

kuragehime. =')

gto
i once saw the 1st opening somewhere before watching the series and i just judged the book of its cover.

code geass
one or two years ago i watched the first ep and then i didn't really like it and avoided watching it.

both of these are now on my favorites

naruto and bleach =/

Ouran High School Host Club. :)
At first, looking at the cover, i didn't like it. But then my cousin and my friend says that it's a very nice series. So I watched it, and turns out, I loved the series! :)

Clannad, and Death Note

Madoka
Meh, more mahou shoujo cr*p? -> Huh, it seems to be more popular than expected, oh well whatever -> *actually checking MAL page* ; Genres: Psychological, Thriller, Rating: 17+ (violence+profanity) lolwut? *starts watching* -> Wow,I totally didn't expect THIS to happen

Dog Days
http://ayakofansubs.info/tag/dog-days/
Started watching because it seemed like an incredibly stupid/horrible anime -> Chocobo? "Franboise"? Takeshi's Castle? Uh...MUST WATCH -> Can't help but I find this anime strangely hilarious

The law of Ueki

I thought Canaan might turn out boring but I ended up really liking it.

Code Geass : I was skipping this for years and a friend suggest me this because it's the closest thing to Death Note, I was skeptical at first but I watched it and both season turned out to be my favorites series of all time.