A lot of people complain about the Wii's graphics. Their loss.
You're not forced to use motion controls in every game though. The developers often give you a choice. Same as the DS where some games use the stylus and others don't.
While it can't outperform a M/KB, I thought the Wiimote was much better as far as shooters go. Analog sticks make console FPS's a joke. There's no precision and auto-aiming takes all the skill from the games. The Wiimote is more like a lightgun for the genre and that works well enough.