It's kind of fun in an unexpected way, but once you realize there's not much to the gameplay after a few rounds, it sort of falls apart. Like basketball was neat, but then you realize that the core gameplay is so limited that it's nothing more than a fun tech demo.
Oh well, I bought my folks a Wii when it came out (and I had the hookup at GameStop) and they got almost three years out of Wii Sports. Even though they have Wii Play and a few other titles, the only other game they'll play is PuzzleQuest. So I'm sure they'll get some mileage out of this one.