Art - 8/10:
As people have said the art looks a little weird. The style reminds me a lot of the Negima anime remake: Negima!?. It looks very cutesy and the coloring style is designed to draw your eyes to it. But to those that can look past those two things they see the reality of it - sure it looks nice and cute, but really it doesn't look right at times. Proportions are somewhat off and the eyes look weird at times. Fact is I thought the art was being drawn by professionals - not teenage girls who only draw anime style stuff (no offense to those teenage girls). Otherwise it wasn't bad at all. Although I do prefer Kai style overall, I'll probably end up getting use to this eventually.
Story - 10/10:
The fact that they included the Soul Brothers in this episode means that the script/writing staff is taking big hints from the original game! About time too~ Although I bet they'll end up screwing up on some things eventually I'll give the storyline a 10/10 for this time around :P
OP/ED - 8/10:
Please do not kill me on this! It's not the songs or the art that made me say only 8 out of 10. Rather it's the design of the sequences. Now when I say design I mean the coordination of what goes on in the sequences.
OP - I loved the music and all but really the video was very...random. One moment I see Rika sitting around outside the school in a few positions, then Rika's hatchet flies down to the sky, then Satoko gives me a mean look and then I see the silhouette of Rika riding her bike while giant Satoshi head pops out trying to eat her! It wasn't very consistent at times in my opinion.
ED - The song was well...well I can't honestly say I liked it as much as I enjoyed the other songs, but it wasn't terrible. Yet once more I felt some things were very random. I didn't understand the giant green bubbles floating around everywhere for starters, reflecting everything. Was it suppose to symbolize the ones in it within different worlds? If so why not just use kakera shards like in the OP? The art here bugged me a lot more than the OP did. The way Hanyuu looked in the one scene with her head down looked pretty weird.
Rika's head near the end when she's being held by that woman (I know who she is but for spoiler reasons I won't say who) looks really big too. And I dare say the ED was even MORE random than the OP. Hell when I compare the ED to the OP, the OP looks damn organized.
Of course I could be looking into this too much. The first season's OP was pretty random as well. Yet Kai's OP was a bit more organized (don't get me wrong, it was random at times too) - it was less than 2 minutes but I felt like I was being told a story just by what happens. Yet the Rei ED just didn't make me feel that way.
Overall - 9/10:
Because I never give 10/10's! Everything has room to improve - nothing is absolutely perfect. As far as it goes I think Rei could improve as far as art value goes. I can't say much for story value, since this is just episode 1 but if they do as well with the story as they did in this episode then I have high hopes!~ (so please don't crash them to the ground <3)