Eh, with that ending I think I'd give the series a 6/10, maaaybe a 7. It was fine, slightly better than average overall, but dragged down quite a bit by the latter half of the story.
The ending was kind of a let down since the final resolution we got for the main characters was a bunch of detective work and guessing who had what kids with what grandparents and whatnot. Not the best way to wrap things up. Another series that will be forgotten with the mists of time, a shame because it had a lot of great potential for a while there.