i don't do dim sum any more. go into uncontrollable eating binge and need weeks to work off the weight. i am not a big seisma or washingtonian fan. both are heavily influenced by ambiance and shmoozing.
i prefer don rockwell and tyler cowen.
http://www.donrockwell.com/index.php?showtopic=14145
and
http://www.tylercowensethnicdiningguide.com/