I played a little MP last night (also played it a bit during the beta), and although its certainly not good I think some of the reaction to it has been a bit over the top, I mean its not that dreadful.... Obviously you'd hope for a lot better and its pretty poor, but its not THAT bad.
On a slightly related note, just noticed the Doom beta is still taking up around 15GB on my drive. I don't often play betas but a bit annoying that it disappears from your library but remains installed, obviously I can just delete it but only now I've noticed.