3.P Tiered Gestalt Rules+Why is each class in its tier?
Players familiar with the original tier system threads may recall Why each class is in its tier.
Rather than break down each class individually, I'll discuss them as a group in their own section:
3.P Notes for Vancian Spellcasters
3.P Notes for Psionic Manifestors
3.P Notes for Martial Initiatiors
3.P Notes for Spheres of Power, Might, and Guile
3.P Notes for Akasha and Incarnum
See also the Archetype Tier List. Note that not all archetypes or other options are shown in the tier listings above. Most don't sufficiently change a class's power or versatility enough to warrant a tier change, and we expect players to bring any problematic options to the GM's attention.