"The plot is hysterical in both senses of the word, at the same time. Things are always happening, and there is always a blast door that must be shut on penalty of galactic holocaust, and there is a guy with evil intentions for humanity named THE DIDACT who looks like a dad in a bad Predator costume, but THE DIDACT may actually have understandably evil intentions for humanity, and your top-heavy computer program sidekick is going crazy, which for her means sometimes getting a bit sassy and turning red, which makes me wonder if I am going crazy, because I sometimes get a bit sassy and turn red, and even though you are eight feet tall and have repeatedly saved the world you have not received a promotion and no one trusts your instincts, and also your first name is John. John Master Chief."
So goes this excellent review of Halo 4 by friend of PopSci (and, um, roommate of me) Joe Bernstein over at Kill Screen. Read it, it's the tops.