Heya Duzzy, I recently started playing X and Y after I got the games for Christmas and I decided to use a Fairy-type on my X team, Sylveon. My results, it actually did really really well throughout the game. Turns out they are quite useful after all, and thankfully I did have a Fire and Psychic-type to back him up when I was up against types he was weak to.
Maybe when I start my Y playthrough I might try a different Fairy-type. But yeah, I was happy with how well I went with using one. Fairy-types surely are amazing!