I refuse to watch Clannad After Story. Major spoilers in the tags.Clannad After Story ep. 16-23.
OMG it turned into a heart-wrenching drama so fast. It almost moved me to tears... thrice! Wow, some of those eps were intense O_0
Spoiler:
I heard that Nagisa dies at the end. In the visual novel, she does indeed die normally, but if you've collected all the lights in both stories, you can save her. Thus, if what I've heard is true, the show is only being true to the original up to a point; it's not using the full ending. If I want the sad ending, I can always play toward that, too, so I really don't need to see the show.
Instead, I'll just wait until the visual novel is done being translated and play that instead.