I rated this a 9. I watched this in April 2016, around the time the second season came out. A school friend introduced the series to me when I was 12, and I feel like 'Levi' is a very cool character but a bit overrated at this point, because he kicks people and bullies the sh*t out of them. (For example he kicked a tooth out of somebody for no reason)
It was quite abusive, I didn't really find it cool to watch. I didn't find it funny but I had more of a heart for the characters Mikasa or Jaeger. =)
It made my heart pound at some points, like when a titan randomly appears out of nowhere and eats a character I developed feelings for. It was very gory, very unsettling and that's what I really did enjoy about it.
I did get very bored with the whole 'storyline' plot developing towards the end of the season about the basement key. Also the ending outro is really creepy but cool, good intro song.