Well, the year is coming to an end soon (again). Pretty much anything set to air this year has already done so with current shows coming up on their last 2 episodes. Let try to keep it to things that started and finished in 2012. That means no Naruto, Bleach, One Piece ect. Of course anime that aired late Nov/Dec 2011 and finished this year are eligible so go nuts.
Honestly, the only series that I've totally enjoyed this year with no faults was Chūnibyō Demo Koi ga Shitai!. It pretty much takes the best of each genre(SoL, Comedey, Action, Romance, Drama) and mixes it up into one unhateable series.
Have at it.