For a role playing game (a massive online one at that) I feel the localization team not only did a brilliant job, but have upped the entertainment drastically. I needed very little encouragement to get my pirate talk on in Limsa, and yet there was plenty of triggers to be found :P
Kinda feel like I should be doing my part by using cat talk in the game from nyo~ on you know? ^^

Last game that impressed with like this was the localization of the Neptuna series with a ridiculous amount of japanese game meme's and reference's most wouldn't get applied to ones we've spammed around here.

Actually translating Japanese to English is like an artform. Studying it myself you start to see where and why things were changed for better or worse. But in this case, it went beyond artful crafting and into a class of its own ^_^ keep it up with an expansions and events that come from this game guys.