Only if it had a good storyline with epic effects and a decent director, and then it'd probably be Mediocre.
Am I seriously the only one who realizes that Halo has a storyline? Seriously, everyone who plays it just flies through everything, then complains when they don't understand and just say it has a shit storyline. I've read like 4 of the 5 [soon to be 6] books, and the story's not bad. Pretty interesting in my opinion. Also, Neil Blomkamp is the would-be director. His short movies are apparently not high budget, yet they look amazing. So
FUCK you.
Anyway, MGS. Pretty much anyone who thinks Ninja Gaiden would be a better movie has never seen or heard of either of them.