Experience Shrine: when done Ascending, only useful with Hunter Perk/Ring.
Luck Shrine: when Luck is at cap, only useful with Hunter Perk/Ring.
Item Drop Shrine: when Item Drop Rate is at cap, only useful with Hunter Perk/Ring.
Defense/Resistance Shrine: good for the low level floors or builds making use of high resistance, at higher floors, only useful with Hunter Perk/Ring.
Pool Shrine: this Shrine needs to be reinvented. maybe a random regen boost of 1%-5% to a random choice of HP or MP. besides returning your HP/MP to 100% once, when activated, it is only really useful when you have the Hunter Perk/Ring.
Monster Shrine: 1 epic monster for more loot and experience. +1-3 epic monsters with Hunter Perk/Ring. this Shrine is really nice when you have your Farming build equipped.
Attack Shrine: more damage is a good thing, no matter what floor you are on. makes it easier to defeat any Guardians summoned with the Hunter Perk/Ring.