i agree, although i'm not dissapointed. everything gets hyped nowdays. i've been disappointed enough times now that i always expect subpar products. in fact, the more hype it gets, the worse i expect it to be.
anyway, although i've enjoyed the game so far, i think this review hits the nail on the head:
http://www.somethingawful.com
scroll down to Tuesday, August 10; On Doom 3.