The combat is Gears of Lost Planet. You have dash and slo-mo, recharging health, three guns and a nade toggle, etc. Cover is deformable and the controls are close enough to Gears to be fine. It quickly becomes repetitive (especially after the eighth time you 'fight to door' 'open door' 'fight guys chasing you through door' 'fight guys at next door') and the dash is pretty limited, but the bosses are interesting in an 8-bit kind of way. The scale of the game blows the Halo series away, amusingly, with huge space battles, detailed capital ships crashing overhead, space colony environments, huge waves of badguys, and loose ammo restrictions.
The biggest innovation of the game is replacing 'walk slowly with finger in ear' load screens with 'switch to first person and walk slowly' load screens.
