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I have played a LOT LOT WII Sports.
and despite simple graphics the gameplay is outstanding , it changes totally the way you play , and bring an immersion far away from gamepad or
mouse/keyboard.
And doing moves standing up like in reality, make you play more naturally and
more efficiently.

..that might be the idea but certainly not the impression I got. Golf and Bowling have a very natural feel. The other games however have a learning curve that is no different from what you would have with a regular controller.

And since this is Gameplay & Game Design I would like to point out "Super Paper Mario" for the Wii, which is just amazing IMO. Being able to see the same level in different ways has become more popular in games, but I have never seen it so well integrated into the gameplay.