When you think about it, one of the least-represented class archetypes in MMORPGs is shapeshifters. They only pop up here and there, such as World of Warcraft’s Druids or Lord of the Rings Online’s Beornings and still come across as a novelty as other class types have been done to death.
Personally, I find these classes a blast to play, as the game is essentially giving me the option to transform between modes in order to deal with ever-changing situations. For a good long while in WoW I played a Drood, enjoying the freedom of instant flight, fast water travel, and the sheer weirdness of being a magic-slinging owl-bear.
Are you drawn to shapeshifting classes when and if they appear in MMOs? If so, why and what have you played?