The game was so awesome nobody needed to test it?
I love the game and consider it to be at least in a tie with Zelda, if not my favourite on the Wii. It's a little on the easy side, but then TTYD wasn't exactly hard either.
I think my one complaint would be how a few chapters have "twist" endings that feel kind of...sprung on the player. You beat a boss, and a bunch of exposition shows that things weren't really as they seemed, complete with sudden, unexpected beahviour changes from the cast.
I think the game's big "problem" (which didn't actually bother me) is that it's not an amazing platformer. I accept this because it's really meant to be an adventure game with platforming in it, but I can see where the so-so platforming design and repetitive combat disappoints others. Personally I thought the mix worked out beautifully, the whole is more than the sum of the parts...or something like that.