Rather than favorites, as that seems to change every once and a while (right now being Fullmetal 2003, going to watch brotherhood after I finish another show I never finished) I'll just post the ones I've liked in no particular order.
-Fullmetal Alchemist (I might actually buy this one, which I don't usually do. I genuinely loved this show.)
-Naruto (My only complaint, I got bored of the chounin exams, I wanted more time watching Team 7 bond like on the first mission. I skipped most of the filler because it sucked.)
-Naruto Shippuden (1: Spare yourself and skip the filler, besides the filler in the current arc after infinite tsukuyomi activates. I caught up with this recently, it's gotten a bit big for itself which warrents anything that occurs after pain being inferior to the original in my book, besides Itachi's arc. )
-Neon Genesis Evangelion (If you have any desire to understand what the heck is going on, do not watch the movies instead, and watch The End of Evangelion if you want to be mentally scarred from sheer absurdity =P)
-Attack on Titan
-Koutetsujou no Kabernari (from what I've seen I like it, it's kinda average though. I will admit it does build up hype, however)
-Gurren Laggan (This is the show I need to finish, and I have no clue why I stopped watching it)
My "to watch" list is pretty long....