Well if you want new ones... From 2010-2015 best in my option would be:
Hunter X Hunter
Gochuumon wa Usagi Desuka?
Sword Art Online
Shingeki no Kyojin
Black Rock Shooter
Little Busters!
Kokoro Connect
Yuru Yuri
Baka to Test to Shoukanjuu
Kiniro Mosaic
Mikakunin de Shinkoukei
Non Non Biyori
Danball Senki
If you mean in this season, best is Kantai Collection. But this season is pretty weak.