I was also underwhelmed trying this after Wii Sports Resort back in the day. I just tried it again last night and had a great time with it.

In my review I describe the comparison with Wii Sports Resort as such: what this lacks in depth it makes up for in breadth.

There are many hundreds of challenges on offer here, it will 3 or 4 hours to see the credits but at that time you're not even half done with the game.