Enjoyable, but Several Flaws (Spoilers)
1) Ava's internal dialogue. If it wasn't limited to "Oh boy he's cute" and "I hope he kisses me" it might be interesting.
2) The EVIL. homicidal nuns. So, so, so stupid.
3) Shotgun Mary constantly threatening to shoot everyone in the face. Yeah, you can't actually shoot people for no valid reason.
4) The ArqTech story line with the stupid kid who talks to angels.
There is a lot of good stuff here. The sisterhood, some pretty well choreographed fight scenes, the likability of the lead actress.
Hopefully they will tighten things up for Season 2.