I bought this one over the 1st edition mainly for the golf and tennis as i enjoyed playing them on the wii. They have proven great fun, and surprisingly challenging when playing the ai.
As a Brit, the American football and baseball were not top priority for me, however they will work you out a lot more than the other games, and the football I am really getting into playing most, even if you do only get to play the offensive part of the game as the computer simulates the defensive.
Skiing I felt could have been better, a bit more control would have been more fun, you basically lean either into a left or right lane to get through the gates.
The darts, which has 3 calibration options, was slightly innacurate. I tried all three 'tv positions' (low, middle and high) but i still find i have to aim considerably lower than the target suggests.
These are the only two flaws imo, although neither really take away from the gameplay as a whole. There is still plenty to play through, and good fun with friends as well as on your own!