I've heard of Rancid! But never listened to them. And I would not have thought they were ska at all. Actually, were they on the soundtrack to that SNES Spider-Man game "Maximum Carnage"? I know Green Jelly was. Maybe green jelly sounded rancid to me and I've been confusing the two in my head.
Good god "Intro" is fast. I've liked the variety of styles, while still being a consistent sound. "Hooligans" into "Crane Fist" is a great one-two punch.