I bought Rumble thinking it was a good idea. It gets repetitive and boring really fast, you have to grind a lot and it's not a guaranty that you'll get the toy you defeated or if the pokémon will appear at all in the course before restarting it 100 times or more.
I liked Snap when it came out, nowadays it looks outdated (not graphically, but in how easy and short it is), a sequel would be awesome.