Attack on Titan was 2013 summer... it's pretty good. The winter anime season started in January so there isn't really much to choose from if we're talking about the best 2014 anime. Here's my top 5 anime for this season so far:
1. Space Dandy
2. Witch Craft Works
Nisekoi had a pretty bad start, it gets better later on. But if we're talking about anime in general instead of recent, I can think of a few better ones.
Almost everything by Urobutcher is a masterpiece. The same goes for Abe Yoshitoshi.
I love Gintama with a passion, so if you haven't seen it you should asap. It's almost entirely focused on comedy but it does switch to darker arcs once in a while and it's done amazingly well. Baccano! was also awesome as hell, you should check that out.
So here's a list of anime in which I would prioritize:
4. Monogatari series
5. When They Cry
6. Serial Experiments Lain
7. Hunter x Hunter
8. Madoka Magica
9. Haibane Renmei