I think it can definitely be useful discussing why someone/I like something. There are reasons we like stuff, however trivial those might be. Understanding it helps understanding of one-self and of the appreciation of art/craftsmanship.
I am sure there are plenty of threads out there with idiot (fanboys) that only play the yes/no game on which games they like, but there is something to discuss about games and other forms of entertainment/art. And i am sure that those can ruin a good discussion about such things, but i guess you can try set the right example.

PS I do not get that people fail to see what he actually is asking. For me the answer seems obvious, but that does not mean i will not answer it. (plenty of stuff is obvious to others which i do not see too.)

Edit: Not a troll! See below, and this post!