Where are the point-and-click adventures?
Have you tried Strong Bad's Cool Game for Attractive People, Zack & Wiki and Sam & Max? (OK, Sam & Max is not a Wii original, but the Wii version is great)
In general I agree with your post. IMO the biggest problem was that 3rd party developers were caught napping. No-one expected the Wii's runaway success. Things are slowly changing though. There are more and more innovative, quality games coming out that were written from the ground up with the Wii's control's in mind rather than crappy ports that are basically PS2 versions of the game with motion control gimmicks added.
The days of the Wii being just for casual games and Nintendo staples like Mario and Zelda are coming to an end. One example of an upcoming Wii game that is both innovative, stylish and that is definitely not "just for kids" is MadWorld. Definitely not the kind of thing you would historcally associate with a Nintendo platform.
However, like you I'm still waiting for quality RPG on the Wii. I also think you would be able to make good RTS's (a genre that consoles have really been lacking in) using the Wiimote