My main is a feral tank, and my team of 3 shaman + priest is being leveled with the intent of doing 5-mans with my druid as the tank. So far the only issue I've run in to is groups of more than 3 mobs. Swipe only hits 3, and even tab-swiping I get the occasional chain lightning that pulls one of them off me. Paladins are the preferred tank because they can tank as many as they have to just fine.

As for buttons, I only use 3: Mangle+Maul macro, Swipe, Lacerate. On trash I hit my MM macro once for the snap aggro and FF that target down with my shaman while swiping. On bosses I spam both the MM macro and Lacerate.