I agree, I don't see why so many people knocked boxing? It may not be 100% responsive to EVERY punch you throw, but it's a hell of a lot more accurate in that department than any game I've ever experienced. It's so much fun. I suck, though.
I didn't like bowling too much yesterday, but today I've been playing it with one of my brother's friends, and I'm starting to get just how true to life it is (spinning, aiming, all of that). It's a BLAST and a half.
Baseball is awesome. I love it. I'm not even a baseball fan at all, and I LOVE this. I can't wait until we get a full game that plays somewhat like this. I'm so glad we don't have to control the outfield and all of that, though - this is all I need.
Golf is alright, but I overswing every time. Still trying to get used to it, but I suspect it'll always be my least favorite of the Wii Sports games.
Tennis is fun. I have not totally gotten it yet (does your actual swing affect what happens to the ball aimwise, or is it more about the POWER and TIMING of your swing with the aim being automatic?) but it's fun - I will devote more time to it.
Talk about an awesome pack-in. For all of the whining people did about it being there, holy cow, I'm going to get a LOT of time out of this game. What fun.