Re: Wii U
The gamepad really isn't too crazy, 99% of the time is just like a regular pad but a little oversized. Pretty easy to get used to playing with it.
Super Mario 3d World is a great Mario game, somehow they still keep knocking it out of the park with these flagship Mario games. Super Mario Maker got old quick for me, but a lot of people get really into it. If you like Japanese RPGs, Xenoblade is a massive game and pretty much the best JRPG of the 2010s.
Sadly beyond like 5 or so titles, the library of games worth playing is pretty thin. Some of the best games on the system are just up-ressed Gamecube games. If buying a system to play around 5 games sounds good to you, go for it. It's Nintendo, the top titles are unique and quality. But if you are mostly getting it for the Virtual Console, just play those SNES games on your PC.