It's a party toy. There's no lasting single player appeal.
I really want to disagree with you, but I find it pretty difficult to do so.
Brawl is basically Melee 1.5, so it's rather disappointing in that respect. It's still a good game, but only for the multiplayer, as the subspace emissary is boring as hell, save a few parts, classic got gimped, adventure is gone, and all-star was never much fun anyway. I also find the shoehorning of the "new and innovative" controls onto Brawl to be pointless, so much that I've defaulted to my trusty 7-year old gamecube controller each time I've played it. It doesn't really improve all that much, and takes a few steps back from Melee as well.
Twilight Princess gains jack crap from being on the Wii, and continues in the tradition of the Wind Waker of making the Zelda series even easier than it already was. Yay dumbing down! The fact it's on the Gamecube doesn't help either.
Red Steel was a massive flop and it's sort of sad, seeing as it could have been great if the controls were properly optimized. I've heard No More Heroes might scratch the sword game itch though.
Galaxy seems pretty nifty, but also seems like it's one of those games I'll blow through in under 10 hours due to lack of any difficulty and would regret purchasing.
Prime 3 is Prime....but with Wii-mote! How innovative! Seems like they could have just put it on the Gamecube.
And the Virtual Console to me is a huge fucking ripoff, as I've either played the games, or I can emulate them myself and have a much better experience (save states, screenshots, speed-ups, etc.).
The Wii seems like a "My-First-Console" thing, either for casual players, or gamers out of the loop, or maybe expatriate PC gamers finally jumping ship. It doesn't present anything all that fresh, just a promising control scheme that is pretty much delegated to gimmick status because no game has really brought it out yet. It has no real "hardcore" single player games as of yet, and none on the horizon like the other consoles and the PC. The only thing it does seem to do well are minigame fests like Wario-Ware in groups or other party games, which are pretty fun. Throw in the rehash of old Nintendo console games that is mostly targeted at new customers and the Wii does seem exactly like a "My-First-Console"thing. Don't get me wrong, I have loads of fun playing with friend's Wiis (hur hur), but I see no reason to get my own (more lulz).