Druids need some changes before I'd play one. The have the ability to transform into different creatures for different fight styles. There's a cat for a rogue fight style, a bear for a tanking/warrior fight style, and even a form for water.
They can heal, and they have a great entangling roots ability (which is a bitch in PVP). The issue with them though is that in group situations they have an identity crisis. They can try to tank in bear form but they are not nearly as effective as a warrior. In cat form they can add damage but not as well as a mage or rogue. So often they end up being the backup healer if they can get into a party in the first place.
What's nice is that Blizzard realizes these issues and is adding more crowd-control ability to the druid that will make them a better tank. I expect to see other changes as well. Looking forward to them!