Going for gameplay? The Wii had the following:
1) The same old Nintendo standbys that they rehash every generation, except now with tacked-on motion controls that everyone hated.
2) A ridiculous amount of gimmicky terrible games that companies pumped out to appeal to the loads of casual gamers who bought the console.
3) EXTREMELY few and far between good titles which took advantage of the Wiimote in a non-gimmicky way, like Boom Blox.
4) Games which didn't use motion controls at all and could have been done on any console, but were gimped and put out on the Wii because of the huge install base.
You're making the classic mistake of assuming that power = graphics, as well. Power lets you do better AI, it lets you have more objects on screen, it lets you do better physics, etc. etc. For a great example of how a game had to be made far worse to allow the Wii to run it, look at all the problems with Dead Rising.
Every gamer I know who has a Wii played Wii Sports to death, maybe played a couple other games on there, and then has let it collect dust. Every non-gamer I know who bought one only uses it as a Netflix box. The Wii may have been a financial success for Nintendo, but it was a dud of a console as far as entertainment value goes.