For live action I recommend Banshee and Vikings which are okay (especially the first, which has a great cast of over-the-top characters and by far the best action scenes in television these days, look at this gold for example:
http://www.youtube.com/watch?v=jqRPaucl8r4)
Also Sons Of Anarchy, Boardwalk Empire and Justified are top-notch but they're more steered to the writing aspect, there's not much action to it (and also are not really recent since they're at least four years old).
I can't recommend anime series since I'm not really informed about them, especially new ones. I watched Cowboy Bebop, Neon Genesis Evangelion and Gurren Lagann. Liked them a lot but not really my bread, I'm more for live action. Attack On Titan should be really good though, maybe I'll give it a look.