Yeah this seems like a pretty good start for a good show. The animation seems to be done well, very nice. The fight scene was good too. They also put in a lot of small special effects that don't have to be there but still are, extra points for that. In my case I love this kind of music :D so that's a plus. Character design is good. I love the girl with hotdog hair, I mean hotdog hair XD, what will they think of next, lol. Fan service is not in your face so that's pretty good too. We'll just have to see how the story goes. At least they got the earths gravity down.
I give it a 9 out of 10 for an opening episode. Yes 9 the opening song sucks, ending song is nice though.
Cool episode I can't wait to see more.