(I haven't read all the other posts, but thought I would chip in my thoughts)
The problem with the Wii for me is the games. They just don't appeal. A few do, but not just enough. And very few new games that I want are in stores yet.
Why not compare the Wii to the 360 or PS3? They are all video game consoles. It may not be apples to apples, but if you can afford one piece of fruit, you still have to pick between an apple, orange, banana etc.
It's features may be a little gimmicky, like the DS, but if great games come out for it, who cares. Just to give an example, there isn't much advantage in having 2 screens. One big one might be better, but games have worked with it and made things different in a good way. Other things like the touch screen on the DS have proven to be great for so many game types.
I think many people are just unhappy with the Wii because they think the games could be better, as the system just has SOOOO much potential.
But hey, ever system has its flaws, and just as many 'diss' the other systems.