The wii is basically a slightly more powerful GameCube with novel controls. It competed with (and outsold) the ps3 and xbox360 which offered HD visuals and integrated online play.
One of the issues with the Wii was that the controller tech was too immature, hence the later addition of the MotionPlus stuff, and how the Switch versions of "use it like a pointer" games are so much more robust.
I for one like every genre but I find it unfortunate nintendo has a wierd focus on casual age friendly games.
Almost any gamer who has played a fallout, diablo, mass effect or RD game also owned a wii.