Played the game since the very early Alpha, hard to even call it a game really. This is and always has been a very fun tech demo. Just don't expect multiplayer to function beyond two people at the same time.
Best DLC / Expansion for an FPS in living memory, something very different from Halo 3 but also very good. I like the pseudo-stealth in the open world.
Almost makes me wish they did more marine-tier missions in later entries, oh well.