The Wii.

It is such an underpowered console, with only a handful of must have titles if that.

But man those titles hold up. Even my little gen alphers love it and get into it. Its mostly just a wii sports machine but its still going strong even in this era of mobile and AAA gaming.

I have a bunch of old consoles but the Wii is the only one that gets regular play without needing convincing.