I would list all my fav things about XIV but damn that 1K character limit eh? ;p
So I'll just slim it down to my core favs.

The End game raiding, favourite thing to do in this game and with each new Bahamut or Alexander you added I really enjoyed playing through the content.
My FC, I run my own FC who I've met up with and is going to fan fest with.
The events. Liking the yokai watch so far be it very grindy lol.