I'm a little disappointed that After Story isn't getting its own Overall Series Impressions thread since I would have liked the opportunity to talk just about that.
Anyway, I've written two blog posts on After Story (
1,
2) and a formal review for
Clannad, and my opinion on either hasn't really changed since I wrote those articles. Honestly I don't really have much to say now on Clannad that I haven't already said or that hasn't been said before.
As far as ratings are concerned, my rating for Clannad is a "Good" 7/10, and my rating for Clannad After Story is an "Awesome" 8/10. Philosophically, I don't think they should be rated together, since they are two separate series, IMO.