So far this anime is making you hold on your chair. I think it's a good anime because the plot is interesting and the characters are great. Brilliant back stories for each characters.
I think the music is good because of the band that plays in the anime (GirlDeMo).
The dialogue is funny, sometimes full of irony, thing which makes an anime a whole lot better.
If you liked "The Melancholy of Haruhi Suzumiya" then you might like "Angel Beats" because of the similarities.
Overall: 9/10.