Every week, WoW Insider brings you Totem Talk for elemental, enhancement, and restoration shaman. Josh Myers once only tackled the hard questions about enhancement but has recently expanded his sphere of responsibility to all shaman DPS specs. (And no, two-handed enhancement is still never coming back.)
Every fight in Firelands has its positives and negatives for enhancement shaman. Rhyolith takes reduced damage for 60% of the fight, but he goes molten at 25%, and you need to burn him before he burns you. Beth'tilac spends the first 3 minutes making you run around like a confused wildebeest while you try to avoid scary fire on the ground, but then he gives you a nice, long burn phase at the end.
This seems to be the Firelands model, at least in the first four fights. Every fight has periods of low damage to the boss followed by intense DPS phases. Shannox, the Hagrid of Firelands, is no different. His first phase will either make you want to rip your movement keys off your keyboard or make you want to reroll an arcane mage, while his second will just make you want to roll arcane.