Let me start off by saying "you can turn the game off" is a terrible cop out of an argument. This is not actually an example of a meaningful choice the game presents you with. The game doesn't actually have any meaningful choices. It doesn't really matter, plenty of games can be good without lots of meaningful choices. But trying to pull that "you could have stopped" crap is really lame. You can stop any game, at any time. It doesn't make it a feature of the game. Just because you chose to continue doesn't mean you actually had a choice within the game situation.
Plus if you had "chosen" to turn the game off at that point, you'd be unable to criticize it for not having played the rest. Very clever Spec Ops fans, very convenient
No but seriously, I feel like that part of the game was flawed in a few ways. The dialogue amongst your comrades implies you actually do have a choice, and the game sets the situation up like a choice, giving information you need to make a decision in a cutscene and then you start playing the game outside the actual operation controls for the WP. On top of that, the clear moral choice they push you towards is not to use the WP. Your comrades describe how terrible it is and don't think you should use it, even though the protagonist tells them there's no other way, almost as if he knows the developers have set up an infinitely spawning killzone right in front of you.
Speaking of that killzone, that part was pretty bad as well. I mean throughout the game you've just been mowing down hundreds if not thousands of goons single-handedly, and now the game is trying to pretend it's impossible for you to do that again? It's a completely contrived plot/gameplay device to get you to use the WP.
However I can see how, if the game had actually fooled you into using the WP without question, and you went in completely blind, not knowing what WP is at all, and you had ignored all previous dialogue, then I can see how it could make a deep impact. As it stands, when I played it the scene fell totally flaccid because I saw it coming and because I had actually attempted to shoot from cover only to realize that the enemies were respawning and they did much more damage here than anywhere else thusfar, and that was annoying.
Anyway jeez I am really ragging on the game. I don't really dislike it, I just feel it gets way too much praise mainly because of the climate and timing it was released in. Plus in a way I feel it really had potential to do much more with its message, and to further examine the relationship between player and character, as well as choice in gaming. However as it is, it's a solid action blockbuster with a very cool setting, and I look back on it semi-fondly for that reason.