If you like 3D Mario at all, you owe it to yourself to start with Super Mario Galaxy, in my opinion. There's only two motion inputs
- pointing at screen to collect some on-screen currency.
- flicking the remote for a spin move that can damage enemies (optional move for the most part, I barely remember even using it).
I think given how cheap a used Wii is now, I bet you got it cheap enough to where there are enough games to get that make it a good enough value proposition. I also think you've been given a pretty good summary from folks here of what might be the cream of the crop for the system. More curious now about what your feedback will be on some of the games you try.