The latter, clearly, is geared towards the U.K. and has a European slant. However, they discuss many American TV shows, movies, celebrities and some of the biggest American news and it's a different point of view.
It's not always that active, but Gateworld (mainly a Stargate fan site) has one section of their forums (SciFi Stream) devoted to other sci-fi/fantasy shows. Quite a few of them have multi thread sections dedicated to a variety of shows. http://forum.gateworld.net/forum.php
Besides AV Club, Vulture has recaps/reviews. Also, there's TV Equals and TV Overmind:
http://www.avclub.com/tv/