I agree with Grimslade, this game is excellent, but if your one of those "this game has good graphics, so therefor it has no storyline and bad gameplay" people, then stay away from it.
And Jorath, this game is based on its original, which was made in about 1992, which is before the thought of making Half-life was even concieved, so its not a Half-life rip off, its an upgrade
Oh and if your read the other Doom III thread, I posted a mod that allowed you to "duct tape" your torch to your weapon, and anyway, I managed to finish the game on Nightmare without the mod so im sure some people can play it on easy and still switch between torch and weapon.