I enjoyed Ascension a lot more than I thought I would, and am genuinely surprised by the negative and lukewarm reviews it has received - and yet, I do have to acknowledge that most of the actual critiques are correct.
The first installment is slow, and not particularly interesting until you get to the final twist. From there, the next two installments move quicker. Also, the ending doesn't feel like an ending. Even BSG, which of course had been setting up for a series, let the initial miniseries end on a note that at least felt like an ending. There are a number of characters in Ascension who don't have satisfying arcs, and a number of subplots that aren't resolved at all. And yes, the show does have a very soap opera-ish feel to it, but not without reason: the laws of the ship restrict procreation, so sex became a currency like drugs in a prison.
The series is compelling in a way that not a lot of new shows are. The central idea, while highly implausible, is nonetheless fascinating, and opens the door to a lot of possibilities. SyFy has been introducing mostly fluff over the last few years so this had a much more mature feel to it.
I hope this does become a series, though I am skeptical as to how long the premise can hold before it gets old. The writers should have tried a bit harder to make the miniseries feel more self-contained. Still, the unique premise of the show and the complexity of the plot warrants a view, especially for science fiction fans.
