Tried Advance Wars: DS and was really turned off by the lack of continuity between levels. No matter how good or bad you did on one level, it made no difference to the next level. Basically made it seem like of bunch of disconnected training levels that happened to have a story running through them. Are all Advance Wars games like that?
I played Mario and even if I did really well in one level, I had to do the whole of the next level. But seriously why would you expect to have bonuses from the previous level? Yes all advance wards games are like that, and I love them.