It seems to me that maximizing damage is a pretty dull way of perceiving crits in D&D? Throughout the editions, the game has encouraged extra benefits on critical 1s and 20s for skills/proficiency checks and what have you. Why not have these little extras in combat too?
What if each class could do some unique effects with a crit?
Fighters could attempt a free disarm/blind/trip check.
Wizards could enhance the spell effect further or product some other beneficial effect for the wizard.
Rogues could gain an additional move action, or bonus to AC for the round or impose an additional penalty on the enemy.
Clerics could enhance the spell effect further or product some other beneficial effect for the cleric, or enhance the undead turning range or put a more powerful effect on the undead.
Additionally, since the game is giving more and more options for additional targets, maybe a crit is only counted on the initial target (in case of a cleave), or 1 person in the spell effect.
What if each class could do some unique effects with a crit?
Fighters could attempt a free disarm/blind/trip check.
Wizards could enhance the spell effect further or product some other beneficial effect for the wizard.
Rogues could gain an additional move action, or bonus to AC for the round or impose an additional penalty on the enemy.
Clerics could enhance the spell effect further or product some other beneficial effect for the cleric, or enhance the undead turning range or put a more powerful effect on the undead.
Additionally, since the game is giving more and more options for additional targets, maybe a crit is only counted on the initial target (in case of a cleave), or 1 person in the spell effect.