I use them often. They take a while to get used to, but once you do, you'll like them. It takes strategical skill to know how to use them effectively in their normal job classes. For example, I like to cast where there are not many effect panels, such as the edge of a map. Considering that they don't have great offense, have them subdue the weak enemies or the ones in a critical condition. As long as their magical attacks hit at least once, I'll be happy.