I've actually been playing this some more. I think the clear winner (from the Sports & Play) is Bowling. The interface is close enough to bowling to make it feel 'correct.' (Golf is similar, but the controller isn't quite subtle enough to handle tap-in putts well). Baseball is really just pitching/batting, and it somewhat works.
I may be biased by the fact that my kids can bowl reasonable well, but have trouble with the other sports.