Personally, I thought Wind Waker was far less difficult than Twilight Princess. Heck, I haven't even beaten TP yet, simply because I keep getting hopelessly lost in the overworld. Galaxy was undoubtedly less diffucult than Sunshine, though; this is due largely to the fact that there are so many worlds to visit that it's quite simple to cherry-pick the first couple of easy stars from them. Some of the comet stars are actually very difficult to obtain, bordering on frustrating. Some of the purple coin levels make me want to pull my hair out, throw it on the ground, light it on fire, and say hurtful cuss words at the ashes.