It's been consistently good all year. I could point to all 12 chapters of 2009 and be happy with them.
By comparison, every other manga I like has had highs and lows. Nothing consistent. One Piece had a good prison, but a poor war. Naruto had a good meeting, but too much emo. lolbleach. Fairy Tail had a dragged out arc, but was consistent in its average-good rating.
The other mangas I either don't read (everything else in the poll), or weren't spectacular (Negima, Ippo, Air Gear, To-LoveRU).
I picked up some mangas this year which I've enjoyed a lot, but upon looking back they haven't had "good" years, it's just that I've caught up (Soul Eater, Kekkaishi, Reborn)
I voted for One Piece; it's had probably it's most productive year since I've begun reading it. Oda really had his hands in a lot of pies. The stories were the same level we've come to expect but the secrets revealed were much more.
OP is an exception, I cant even remember when i started to read it. Anyways I voted "other":
I'm not sure which was best in 2009 for me, but I agree that Liar Game was really good. I also enjoyed from the relative new ones, Those who chase the Ageha (a cool chase, a fantastic humor and some neat stuff the "hero" can do is all I say), and Gamaran (finally enemies get sliced up no blabla and stuff, really refreshing). Besides Gantz finale phase was amazing, though not much happened yet.
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First voting round has ended, we're now moving to the FINAL VOTING ROUND for the Mangahelpers Awards!