I forgot about Earl's. I don't care for their BBQ but the burger was pretty good.You stated OKC area so I'll limit to that.
-Add a big thumbs up for Patty Wagon. My favorite fries are there, too.
-Lipsmackers is good, said he was moving to the Memorial Rd area though.
-If you like a big, char grilled burger with a patty a little on the thick side Earl's Rb Palace is pretty darn good.
-If you like a more conservative size burger that's closer to a diner burger type, I recommend Little Mikes on NW Expswy.