It's called Stockholm Syndrome.
I always get very confused whenever people use the term "Stockholm Syndrome" because it 1) has a very specific meaning in the field of psychology related to captors and hostages and 2) has a very loose popular culture usage that seems roughly equivalent to "you irrationally love something you should hate".
If you mean it in the context of number 1 then, yes, there is some Stockholm Syndrome going on. If I were taken hostage and forced to place Skyward Sword then I would very much have irrational feelings of sympathy toward my captors...for they clearly have decent taste in video games. If you are using definition 2 then, no, there is no Stockholm Syndrome present. I recognize all the game's flaws and have listed my least favorite parts above.
I thought Groose was one of the best characters to come out of a Zelda game.
I can see why people like him. For me, he just had too much of a "frat boy" persona. That and his haircut. I have this weird thing about distracting haircuts.