The story is also pretty much the same as in Tron: Legacy as well. Get sent to self-contained world. Kill mooks. Wake up bad-guy. Bad-guy re-purposes programs to invade outside world and has access to a giant ship meant for said conversion and invasion. Must stop badguy.

I liked Bungie's Forerunner look better. It had more of a solid, "how the fuck can this be anything other than a box" look to it. More cryptic and ethereal.