Just finished episode 10 of this, and I love it. I can't wait for the next episode to come out, it just keeps getting better and better. I know it hasn't finished yet, but I am finding this to be one of my favorites.
The most violent/gory scenes that come to mind are the first episode of Elfen Lied (though this could be because I was first introduced to that genre and was most shocking at the time). Another one is episode 7 of Gantz: Second Stage.
I love the music (Not OP and ED) from Fairy Tail, it is different to other anime and sounds amazing. I also like FMAB's OPs and think the bgm is great.