As someone who owns over 100 Wii games, I must be some kind of rarity in that I'm actually satisfied with the Wii. Sure, there are certainly some things I don't like about it and decisions I'd have rather were made differently, but as several people have pointed out, there are plenty of games which never would have existed without the Wii. I just have to take the bad with the good, which is true of just about everything in life.
As far as this year, I'm looking forward to Fortune Street, Kirby Wii, Mario Party 9, Rune Factory Oceans, Zelda: Skyward Sword, Rhythm Haven Wii, Rayman Origins, and a few I know I'm forgetting. On the already released side, I have Mario Sports Mix, de Blob 2, Lost in Shadow, TrackMania, Mystery Case Files, Wii Play Motion, and again, I know a couple slip my mind. Sure, it is a little lighter than last year, but that year was incredible. I actually expected less than what I've got to look forward to this year, so I'm still plenty satisfied with the Wii; just as I've been since mid 2008, and just as I imagine I'll be for many years to come.
In point of fact, the only game on Wii that really disappointed me is Super Smash Brothers Brawl. But I'm not trying to start something by saying that, so I'll leave it there.
Since I'm here, I guess I might as well rate my preference with the systems:
1. Nintendo 64 - It's hard for me to not place the system that got me interested in games as number 1, but even if I'm going by enjoyment over nostalgia, this system has offered me countless hours of enjoyment that no other has matched.
2. Wii - It has its problems but Nintendo have made some of their best games on this system. Not only that, but I've really enjoyed some of the obscure third-party offerings that never would have been made for an HD system.
3. SNES - I never had one of these until after a Nintendo 64, but I have still played some games over at friends. This is when I feel gaming really got good, and many of its platformers and RPGs still hold up today.
4. GameCube - There isn't much on this system which I feel is better than its Nintendo 64 equivalent. SSBMelee and Metroid Prime carried this system for me.
5. NES - I'll always remember it for having the first games I ever played, but few of them stand the test of time and I just don't enjoy playing most of its games anymore.