It was too neat a wrap-up in the end, considering how Jennifer Aniston's character had developed. And the part with Seth's character also seemed too neat as well, and not in line with his character up to that point. I guess they needed to get an actual conflict in there somehow, but it was a little forced.
It would have been better IMO if Paul Rudd's character went back to NY to be successful, but the wife stayed behind. As is, the ending was just too typical.
Still, funny stuff. More Ken Marino would have been fun. He's really, really good at being a thoughtless dick.
And as a side note, there's one character that I SWEAR was written for Jane Lynch, but she might have turned it down for scheduling or something. I have to check imdb on that...