Well, I have to say, that D.Gray Man is still ongoing and it realesed 2004 year(there is anime, but a lot of fillers actually killed it, so I can't reccoment it unless if you skip all fillers, but then again there is cencorship so...
Pandora hearts manga 2006 year, finished like in 2013 or like that, there is also anime, but I wouldn't reccomend it, case it have different ending than in manga.
And yes you should really watch other stuff man.
Oda has potential to be great mangaka, but he losed it...
And you can't compare him to Hoshino(D.Gray Man author) who has healthy problems, that even can't write at all, it's killing her, but she still going in, and release one chapter in three month(right now) with beatiful art work, and that gray atmosphere that her readers love