You are in the same boat as alot of people, but you have to remember that the game developers on any system need time to discover the potential of any system. I'm sure a year from now the titles you are craving will be available, or in development. When I bought the PS2 (on launch date) I was pretty disappointed almost immediately, but a year down the road, the killer titles started coming out and suddenly they were using the full potential of the system.
Nobody held a gun to our head and told us to buy the Wii ASAP, and with any launch, the titles are mediocre at best (with maybe 1 or 2 stunners). I guarantee you the game developers will do everything they can to make the most out of the wii's capabilities, because graphically it's far inferior to the competitors, but the interactivity is one of a kind at this point.