This is inevitable after the lukewarm feedback from the alpha and the plagiarism sitaution. The whole internet is basically out for blood.
Honestly, I think the fact that Marathon is in a niche genre means it is going to have difficulty attracting casual players.
I hope they can add a single player campaign which will make it more appealing.
They really need to take their time on this one. Without major change releasing the game will be a suicide.