Katekyo Hitman Reborn, Eyeshield 21, Bleach, Naruto, Gundam, and a few others I can't recall at the moment.
For KHR, it was very silly in the beginning, and I just couldn't get into it enough to really read it, but gawd Kid Lambo is so adorable! Only plus thing <3
Eyeshield 21... I don't like football, so it didn't get me much, but Hiruma was hilarious.
Bleach/Naruto: SO annoying D: The voice actors make me cry because a good 90% of anime dubbed SUCKS. *cough*Death Note*cough*
Gundam and most mecha animes: I don't like mecha animes... they just aren't interesting to me, especially cause most of it has to do with battles, fighting, and firing things at each other in the hopes of killing the other enemy... >>; The only mecha one I liked was Zoids.
I prefer well made animes, with amazing graphics and details, with voice actors that aren't used in every other anime out there, and that hold a good plot line, keep me suspenseful without boring me... D: Also, if it holds too many episodes, I usually just go BLAH and quit,
Although Sailor Moon was one I stuck with, as well as Inuyasha. :s