Gamespot is right... Skyward Swords controls are bad.

[SvennoJ]

Wyrdness said:

Here's a tip do slashes and motions slowly and more casual, after watching my cousin play and seeing him doing these odd waggles motions or try to do fast actions I can see why WMP misreads motions if that's what people are doing. If anyone is having problems just stop and do the motions much slower, I never had a problem when I did that.

 

Another tip is when you are about to use an item or do something that requires an aiming style mechanic, position the Wiimote into a comfortable neutral position for aiming before you do so otherwise you'll be constantly using recentre.

That really helped. Success rate has gone up to 90% now, I'm finally at the end of the forest temple.
I was playing it like the gladiator duel in move sports champions. Slow little movements work much better.

Enjoying it now, thanks.