Well, I, and many of the people that I know, consider the two Super Mario Galaxy games to be two of the best games of this cycle. And I appreciate the fact that when I bought my Wii, it was a hundred or two cheaper than the 360 and three or four hundred cheaper than the PS3. I appreciate the fact that the games start out $10 cheaper. (For what it's worth, the Wii's crappy Internet connectivity and onboard storage means they gouge us less with expensive downloadable content. Each Call of Duty game, for online players, doesn't cost $60, it costs $105.)
Perhaps more importantly, almost no one I know who loves playing on their Wii console regrets buying it because it has lesser graphics. Consider that most people bought one knowing that going in---it isn't like Nintendo is hiding the fact that its hardware is inferior. Maybe it is true that you can't have graphics and fun, if graphics makes things too realistic as to ruin the gaming experience or if the focus on graphics means developers don't focus on fun (for which I revert back to my Transformers 3 comparison).
Again, people can complain about graphics all they want, but if that is the *sole* reason they avoid one video game over another, then I question their taste.