Well, to find out what this game is missing, you have to find out what this game had.
1. A great big galactic war. That started too early. Hour one was great. Hour ten was great. By the time you got to hour twenty five, you were just like, "Yeah yeah, wear on.. Yah, I get it."
2. Militarism out the wazoo. Great, you mean I could shoot Admiral Hackett in the face because of my Spectre status (and get away with it) and yet I'm still saluting him and calling him sir? Wait, what?
Those are my two biggest complaints about ME3. Personally, I think that number two is one of the reasons why ME2 did so well. I can't remember Shepard ever saluting anybody.