Waaaaay too slow. The amount of time you have to watch people just staring at each other and staring into space in wide eyed disbelief, ugh. And the action is way too slow and redundant. It's like they didn't bother to do enough writing so they just drew it way out with repetition, wandering around, and staring. They could have taken out all the filler time and made this show at least half as long. I ended up watching it as I did other things, since it was so slow I never missed anything even while not paying any attention for short stretches.
I'm still giving two stars because the last episode was much better than expected.