Overrated: For the 10th time in this thread: Striders, I mean for real, nice DPS, but when you're dead from being unable to KB stuff it means its a class that really needs support just to be at its 'best'
Underrated: Elemental Master, rune of meteo is a huge DPS buff but i haven't really seen that many of them lately. People also don't realize they have some of the best balance factors of all classes. (mainly with earth and fire)
Make life what you want it to be.