To clarify, OP, the JaronK Tier system is what everyone is talking about. They have nothing to do with optimization, since they measure classes, not builds.
Originally Posted by JaronK
Frankly, a Wizard can suck even more than a Fighter could ever dream of sucking. A Fighter can stab himself to death, but only a Wizard could Plane Shift to some horrible far realm to be tortured for an eternity of insanity.