In the meantime, the campaign is starting to drag. I'm on act 5 and some of these missions just take ages to finish. It's not even challenging most of the time. You can tell whether you'll win after a certain point but actually getting there is still a slow process.
I'm sure it was a problem in Advance Wars too, but not to this degree. The mission design just isn't as good here overall.
I've just had my go on the 4-player rumble, but I think my online trial runs out after the weekend and I'm not going to renew because I'm not likely to play this much more.
So I'll see how far it gets over the weekend and then abandon it if necessary. I'm not doing well anyway, so I might be out by then regardless.