Movies based on games more often than not tend to suck real hard but that didn’t stop Microsoft from sanctioning a movie based on their best selling franchise, Halo. The movie was to be directed by Peter Jackson but that fell apart due to certain legalities, the details of which weren’t made public. And then Steven Spielberg was rumored to be attached to that project but that fizzed out as well. Since then the game’s been stuck in development purgatory not really dead nor fully alive.
But through all of this Microsoft remain really keen on making their Halo movie even if they have to fund it themselves. Here’s what Halo’s franchise development director, Frank O' Connor had to say on the matter, “There will be a Halo movie. We don't need a movie. But we'd like a movie. We'd like the moms of gamers to see the movies because they would love our characters. Maybe we'll even fund it ourselves.”
He also said that if for some reason a movie never happened they’d be pretty happy making a TV show in the vein of Band of Brothers or Rome. I for one would prefer them to model a TC show on something on the lines of Generation Kill. Gritty and totally badass.