I remember X-2. It was so… strange. Random strange. Weird. Stupid at times. I did like the girls, though, especially the main protagonist. So I'm not surprised girls prefer to cosplay them! I would, too, if I was into cosplaying. People have said many times that I look like a copy of Yuna, my psychologist even suggested that it's the hidden reason I liked her (oh my gosh, that's hidden narcissism, I guess?).
I can't say that these games are my favorites, though, but they're so much better in gameplay than XIII that it's not even funny (I can never get tired of bring XIII up!). Not sure if I want to give them a shot again, there are many other games on my list, but I'd be interested to see cuscenes rendered in HD, that's for sure. Watching a HD let's play will probably serve that purpose better than having to replay.
Oh btw I remember a WTF moment in X. When I first saw Rikku, I thought she was naked, or rather wearing a… net? I'm not sure if it was intentional for the audience to be so confused, but it made me drop the game, it was that disgusting. I picked it up much later, after people told me I was mistaken, and only b/c I kinda saw many pictures of Yuna and wanted to see her in the game. Still not a big fan of X to this day.