I get a kick out of the FATE and quest names. Also the little speech bubbles you see when walking around are often hilarious.
"Blood, Augur, Hex, Magiks" :lol:

I find, for the most part, the dialect choices have made the game richer. You can "hear" the region someone is from in the text.
It's not like they've gone and turned serious main-quest dialog into a bunch of jokes.
But the running around, repeating, kill-X-of-Y stuff kind of deserves to be treated a bit light-hearted, as acknowledgment of how standard it is.
Goofy humor has always been a staple of FF games too.