I waited in line to grab a Wii on a whim and it's definitely fun but considering that first person games tend to give me headaches, both in the sense that I'm awkward with the controls and that my head tends to ache after awhile, I'm not really loving it. Trauma Center is pretty fun, but I got tired of looking for tiny hidden objects in Zelda and I get light headed just watching my fiancee play Elebits. There are a few games out that look like they might be fun, but I'm pretty sure that our Wii will fill the same role that our Gamecube did; fun, silly multiplayer games for when we want to veg out in front of the TV together, but not terribly much more.
I'll probably pick up a 360 or PS3 at some point, but I'd like to wait and see how the games shake out first and wait for the prices to come down to something reasonable. I'm using the high prices as a great excuse to sit down and play a bunch of old PS2 games I never got around to playing. I'm more of a turn-based person or, if real time, easy person so I'm not seeing too much out for me right now.