I'm a wee bit surprised this game isn't selling as many copies as I think it should be, because it is a great game. I've only had it for a couple of days and I am really enjoying it. The unit selection is a bit fiddly to begin with, but you'll get used to it.
Depending on what unit you control, will also decide the controls, which I think is a nice addition to the game. With some units you will use the control stick on the nuchuck to move them. While with the aircraft, you control the height by moving the Wii remote up and down, and turning them involves turing the Wii remote left and right. While the control stick controls the speed.
One of my favourite moments has to be when I first got to control a fighter airplane. Within five seconds of taking control of one for the first time...I crashed it. A few times when I have completed a mission, I see one of the grunts doing a wee dance, as if to say: Oh yeah, we win, you lose. Thats one moment I really like.
While it may not look it, the game is tactical. Each unit has it's own strengths and weaknesses. e.g. Anti Air untis will make short work of your aircraft, so you'll want to keep them clear of them, while your ground units pick the Anti Air units off. Or a submerged submarine is attacking your Battleship, you'll need to send a frigate, or your submarines to take it down.
There is a lot to this game, and I can see myself going back to the campaign mode again and again, just to get an S rank on each of the missions.