I don't get why people insist on saying everybody else's role is a faceroll. Personally I find it insulting when someone says my job is so easy and that their job requires more attention. In this game all roles have require attention to mechanics. Reactions to mechanics is what makes you good at your role. Now mind you some individuals might only use 3 different spells total while others end up setting up keyboard bindings for all their spells and actions because they want access to all of them to maximize their effectiveness. In the end if you see a fight going wrong and you contribute to succeeding by doing something beyond your primary spells thats what turns a faceroller into a real contributor.
Personally I play a prot and holy pal, feral tank druid, and a frost mage and I find all the roles are equally engaging.