The extended cut was made in such a way that a perfect ending should be possible in a game without import.
There's not much else I can say about this. This forum is not official support. The easiest way to increase your military strength is to modify your save file, which is the best advice you can get from a fellow player. If you are unhappy with the game mechanics and/or EA's business practice, I suggest sending feedback to them, either by contacting official customer support, or tweeting your concerns to @masseffect or @bioware.
