As for the show / finale - I thought the CGI was pretty poorly done... and not really interested in X-Men Lite cash-cow attempt ("WE NEED A UNIVERSE!!!!") when the pieces needed to even get it started are so poorly done and hollow. Even Carrie's acting - which was great for almost the entire show - suffered in the last episode because she simply had ****ty material to work with. (Though to be overly critical, she tried a little to hard mimicking the Sissy Spacek post-blood-drop walk with the bent hands and it seemed forced where as Spacek's was unnerving)
Flanagan's wife's character was fine/interesting (though he better be careful with how often he casts her, ask Rob Zombie), but the Temu Martha Plimpton and the astral projection girl cheapened the production significantly. Rest of the acting was superb.
If Flanagan wants to create the DT universe he's going to have to really expand on a lot of flimsy ideas/concepts, but the world is there... I just think it could have been hinted at a bit better in the finale rather than shoved down our throats. Have the interviewee character stop Carrie's mom heart, drop the astral projection girl altogether and just have Carrie disappearing out of town on her own post-destruction. Keeps the universe building open but doesn't cheapen the show.