I enjoy Lunar's use of slang. I think it gives the characters style (epsecially Gin) - most of the time.
I'm just afraid they're doing what Terra said, and making Gin a hick. Pretty soon we'll hear him say: "Y'all come back now, ya hear?!?"
Thanks Honoko for the info. I don't speak jap so I can't pick up on the accents. I just know that translators usually use a Texan accent to represent Kansai-ben.