I've started a Link to the Past today, and I've put Advance Wars aside for that.
I started playing Advance Wars some time ago, but Mario & Luigi let me put it aside for a few weeks. Firstly, I didn't like Advance Wars that much. I thought it was a bit complicated and losing sucks. But after some time, I got to know the game mechanics better, and recently, I've been playing it all day long. It's been addicting for me, and I'm thinking about buying AW: DS after completing LttP, but I'm not sure.
So I liked Advance Wars, and I've rated it 9,3.