Halo 4!
It is engaging and gorgeous, and the storyline follows from the preceding games (Halo: CE (Halo 1), Halo 2&3, Halo 3: ODST, Halo Reach and the RTS whose name I can't be bothered to remember). They explain enough of the backstory that you don't need to have played the previous games, or read the supplementary material* to understand what's going on.
There are some changes to the Chief's armour and one of the ships, and I kind of wish they hadn't done that. It wasn't really necessary and doesn't make sense in-game. It's strange that they'd seemingly pay so much attention to continuity then change two things that help tie the new game to the one preceding.
But. BUUUUT! I will forgive them this because...there is a mech. You get to pilot a mech. A mech with unlimited ammo and unlimited missiles! I was sad when the mech part of the game was done, but it was followed by a sniping level which cheered me up again.
I used two mechs, actually. The first one wound up on fire. I broke the streak of winding up with every vehicle I drive in a video game on fire earlier in the game, though - it doesn't count when the fire is part of a cut scene, right?
I should finish the game before I head back to work on Tuesday. Here's hoping it doesn't disappoint.
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*This trend where you have to have read the comic, read the fake blog, seen the videos, etc., etc., in order to understand the basic storyline? Screw that. I certainly don't mind extras that enhance the game/movie/whatever, but I should never ever ever be lost on a plot point in the main storyline because I wasn't interested in obsessively scavenging (and spending money on) every little piece of media that came out since the project was announced. That's greed, and worse, bad storytelling.