I actually like it. I went into the theater expecting just a god awful movie as the trailer did the final film no justice. If you go in there expecting a carbon copy of the doom story, or if you go in there expecting some kind of philisophical movie that has some kind of a point to it, you WILL be dissapointed. However, if you go in there simply because you want to see a sci-fi movie with a mix of horror, action, and a little comedy, then you wont be dissapointed.
I would have to agree with a few reviews that this would have to be The Rock's first bearable movie. Sure, there are some meaningless subplots and cliche'd jokes and one liners, but as i said, thats the kind of movie it is. Think of a cross between Aliens, Resident Evil, and the Doom videogames, and that is pretty much what Doom is. If you liked two of the three, go see it. If you didnt like any of them, go see The Weather Man (also a great film).
I recommend it to everyone who has played the original doom. See it once in theaters. I give it somewhere between 7 and 8 out of 10, and yes, I probably will buy the DVD when it comes out.