Why I think every other FPS is better than Halo, Halo 2, Halo 3, Halo 3 ODST, and every other future variant of Halo FPS (because Halo Wars is actually forgetin' awesome.). Yes, I can tell what the plot of the next game is. Why/how? Because every other damn Halo game is the same exact thing. It's run to this, run to that, get this get that save this save that blah blah blah blah die because some forgeter melee'd you in the back etc etc.
There is absolutely no difference in plot between the Halo games (again, HW excluded since it's made by Ensemble and is an RTS). Halo 3 ODST was the same thing except you have amnesia or some stuff and its an attempt at a free-roam game.
It's literally the same game over and over with some errands here/there plot and updated graphics (in Halo 3's case, over ninethousand levels of bloom).