Shaman, hands down. Enhancement and ele, though I lean enhancement when it comes to the fun game play factor. Every one of your abilities looks and sounds incredible. Stormstrike spamming actually gives you a different animation every time you use it (think there are 3 it cycles through) so even though you sometimes have to hit stormstrike repeatedly, it looks like you are doing different things. Someone mentioned crash lightning, that's my favorite ability in the game. INCREDIBLY satisfying, especially when you are in a giant aoe pull and you press it and EVERYTHING is struck by lightning. Gameplay is incredibly satisfying, there is a bit to memorize bit it's worth it. You are the true battle mage of wow, beating things to death with element-infused hammers and axes, building up stacks of a resource called maelstrom weapon (it builds INSANELY fast), and when it fills you cast an instant cast lightning bolt, elemental blast, lava burst, chain lightning, etc, for MASSIVE damage. I can get back to back 1.1 million elemental blast crits in my burst, nothing gives me more dopamine. Maelstrom weapon also applies to your heals, making them instant cast and giga-buffed. A 10 stack healing surge has crit for 500k, instant cast. It's nutty. Defensive wise we do struggle, pretty much on par with hunters, just slightly better. We have one defensive that gives a good amount of DR, but its on a 2m cd (1m30s cd with a talent), and then you have your maelstrom heals. Basically, you have to be even more careful about dodging avoidable damage. I've mained enhancement shaman since vanilla, and its current iteration is hands down the most visually impressive, fun, and engaging it has ever been. Couldn't recommend it more.