The "new experience" (i.e., gimmick...at this point) of the controls wears off. As far as the controls go at this point, no games really utilize the whole motion thing well. The vast majority of games could be played with a traditional controller easily without missing a step.
That's not to say that there isn't fun to be had on the Wii though as there are plenty of fun games. However, it really depends on what games you're interested in. The best way to judge whether or not you'll enjoy the console is to just hit up some review websites and read about all of the games. It doesn't matter how "revolutionary" the controls are or whatever else if the games don't interest you.
Go here and read reviews of the only games worth playing, really:
Go to the previews section to check out games that will come out in the future.