Angel Beats!... hmm ... is a great anime series with an almost null story.
I loved it for the opening and ending songs, whenever I had the chance to listen them I did.
It has many funny scenes but the drama scenes are even more. I almost cried at the ending and when the characters reveal their cruel "before-they-die" life.
Unique characters with unique skills/abilities and unique emotions.
I give a 9, if it had a better story I would give a 10