Lol core gameplay is far from "broken." What's broken is the design of the game in single-player. Multiplayer is well made and enjoyable, but they should've been rushing to fix and support this game from day 1.
After all of their bullshit, they should've seen this coming. I mean, even with the popularity of mp these days, and the longevity it can bring to games, A:CM was sold on the story, the atmosphere, and replaying something close to Aliens. Even though the mp component was strong, and still has quite a few players on consoles at least, they haven't been supporting it at all.
Their behavior, be it restricted by legal issues or whatever, has shown the community that they don't care enough to try and save the game when the time is right to try something like that. All it would've taken would be a simple "we are working hard on a patch, please bear with us" or something.
This is just embarrassing, and confirms what the angry community has said about a bait and switch.