Sorry, obvious reasons aren't so obvious to me, unless all of your previous consoles were Playstations.

My primary reason for getting Wii ASAP is to play Zelda. That's really the strongest thing in the line-up for me. There are a few other games that look interesting at launch that I can do without, because there are several games coming out for other systems that can hold me over till Mario or Smash Bros or whatever. PS2 still has a heck of a lot of quality games coming out, 360 has a few (but if I had only a 360 it wouldn't be enough), and DS is just pumping out hits right now. I might even pick up Lumines 2.
Zelda will probably jump right to the top of my 'Play Now' list when it finially reaches my country, but after that it'll be back to my more aged systems.