before i get crucified for saying this, let me just say that Halo has AMAZING potential to be a fucking epic movie if done the right way.
It's just such a good excuse for an epic story and tons and tons of ultraviolence and gore with a PG-13 rating.
With the CG at the level it is, can anyone say that a Halo movie would be anything less then phenomenal?

Also. Metroid.
and FEAR, as was previously stated.
If they flesh out the characters so that they DONT suck, it would be an amazing movie.