SS1 and AOF2 had some good, funny quotes, and SS2 had good Engrish and Cham Cham's swearing, but the greatest video game quotes come from the 8-bit era and earlier. Super Mario Bros., Pro Wrestling, River City Ransom, Bad Dudes, etc..
I can't remember any AOF2 quotes verbatim, but there was a lot of great pre-fight dialogue (like John and Mickey singing "I did it my way") in that one.
SS1 quotes:
Jubei: "Amakusa...the tough?"
Jubei (pre-fight): "Can you bare [sic] to my fatal attack?"
Jubei vs. Jubei (pre-fight): "Wouldn't you like to be a Yagyu too?" (reference to old American advertising campaign for Dr. Pepper soda pop)
Gen-an (pre-fight): "Will I get some of your estate?"
Kyoshiro (pre-fight): "Now in this scene, I rip open your belly."
Wan Fu: "I thought I was dead. Then again, I also think I'm Cleopatra, too."
Tam-Tam: "Feel the samba rhythm. Chika-chika-chika. Babalooh!"
Amakusa: "Die, you crazy funster!"