At first I thought this anime sucked, but after the first season I was so intrigued. The second season, ohh my word, I never had mixed emotions in any anime other than this one, I almost cried, laughed, got angry, and pitted some of the enemies. Season two is the definition of masterpiece. I haven't seen season three but I know it's gonna be amazing.
And: levi, Mikasa, armin, Commander Ervin and my boi Eren will forever be my favorites