I liked the first episode a lot I just wish they showed more of how buddy buddy he was with the first girl before this happened. I also hope they take it a bit slower because this ate up a few chapters fairly quickly. But it was a great set up episode so you get used to the world itself.
It had fantastic music too, one of the few times I actually noticed music in a show like this. Seriously listen to this OP.
[ame="http://www.youtube.com/watch?v=R1xFM49RZHk"]YouTube - The World God Only Knows Opening[/ame]