This Game's totally AWESOME!!!
You should Give it a try and You'll become a big megaman fan like me. I didn't play it on a DS(I wish I had one) but on no$gba.
It's too fun game, you should also try others like Megaman Battle Network on GBA, Megaman X, Megaman Zero, Megaman, Megaman Legends and other Megaman Games. They are really cool!