Haven´t seen it yet, but the critics weren't too nice for Doom.
Now I think about it, it'd be really hard to make a decent game-adaption. It's the same as you watch, e.g. your friend playing a game. For 2 hours long.
Splinter Cell Movie!?
For the love of god, no.
Hollywood keeps doing them though, so they must have their reasons. My theory of why is below:
Sheep. We are all sheep.