I think there were parameters that FOX ordered that only allowed GBX to do so much with the game. I wouldn't call it "consolized" exactly.
A free-roaming game with more open space does have it's advantages but it would also force developers to manipulate the mythology more...and I'm not sure FOX would (or some fans) would like it too much. If we were allowed to leave Hadley's Hope in the style of Fallout 3, what would we find??? Another derelict ship somewhere? A secret WY research center? The developer of a free-roaming, unscripted game might have to consider this sort of thing and I'm not sure FOX would want to license out one of their IPs so that anyone can do whatever they want with it. A scripted game keeps things nice and neat and protects the IP.
And I'm not defending the structure of the game, I'm just trying to give another angle to rationalize it by. Personally, I hate games that are too scripted. For example, If I shoot an alien first will it register with the CPU or will my shot be completely neglected so that a fellow marine can be abducted according to the script??? I have a problem with things like this when I've actually seen scripted games that allow for multiple paths towards completion. Hopefully A:CM is one of them.
Keep in mind, these thoughts never lead to questions that a mainstream interview can acknowledge. The politics of who dictates what in the construction of a game isn't something that is always readily available to the public. I'm just speculating that a lot more goes into deciding these things than if they have a console or PC preference.
Either way, I'm buying this game no matter what.