Mekakucity Actors might be my favorite show this season. The art direction is fantastic, and the inherent oddness of it all has already gotten me hooked (I've rarely wanted so much for the week to get moving so I can have a new episode).
For the uninitiated it's actually based off a trilogy of vocaloid albums, the tracks from which have been recreated in the show with new singers. Highly recommend checking out the originals though, I've been listening to the first, Mekakucity Days, pretty much nonstop since I noticed it was available on Spotify.