He sounded like he came from Mayberry in 2002..he started throwing his voice with the rapper gimmick in late 2002 and beyond. Went 100% wigger with it. He started to change in the middle of 2005 when he came to Raw and stopped rapping. When he changed, Cripple H basically shytted on his entire gimmick leading to WM 22 in a faceoff and I'm pretty sure he was told never to come at Cena like that again and he's never said anything slick about him since.
When he's in Boston, he tryies to throw his voice like those people over there. It disappears when he goes to NY shows of course or Cali shows. He also tries to sound like some down south preacher.
He's just as phony as it gets basically. Surprised Austin hasn't got a kick out of that on his podcast.