Um, remember that most films are based in some way on a book, comic, game or remake of something previous or on real life.
Most of the unique/classic style of films don't really get the limelight or much publicity because they are so different.
People go into films having seen trailors, read the book, played the game, seen a previous film and they have preconceptions and expect it to be just like what they expect. Everyone is unique.
I don't care if it follows the game or not. For me, any film based on something like that, does not have to follow what we all expect, far from it, it is something to explore the 'universe' of that game and to expand on things. The Doom series of games is one thing, but the film opened up the publicity for it again. There will obviously be people who have never played Doom (for whatever reason, age, no access to pc, game is too 'low graphics' for them, whatever), but they now have an experience of Doom.
The FPS part of the film is awesome, yes its short, possibly too short, but if the entire film was like that, then the viewer would see a vent and wonder why the character didn't go through it or would have switched weapon sooner or something. Would you play a game where you actually have no control of anything your doing, at all, but just sit there and watch it happen? Probably not.
Instead of always comdemning everything when you hear something new is coming out, why not actually wait to see it for yourself? Its not your money that they are using to make it. People, in general, are too quick to be negative and complain.
As long as your entertained for a while, then what does it really matter?
Of course, you could feel free to write your own [unique] movie script and pitch that... Maybe if instead of people using all the time they spend complaining, to actually spend it being creative, then there may be more unique films out there? Or games?