Evil Cleric breaks the game with minions.
Ioun Stone + Bead of Karma = 100HD via Animate Dead.
Phylactery of Undead Turning = 24 HD of Commanded undead through Rebuking.
Armor of Undead Controlling = 26 HD of undead per Command Undead.
Planar Ally & Gate = Need help?
Elemental Domain = 20 HD of Commanded elementals through Rebuking.
And many minions just by being X give bonuses.
Like a Shadow gives you Concealment while standing in your square.
An Air Elemental+FoM produces an area try-to-pin effect that negates arrows being used against you.
A single Hydra is better than a Fighter, you can own a dozen.
I suppose if you want, you can get into the melee side. Animal gives Shapechange, grab a Monk's Belt, cast Quicken Death Ward to use a Life-Drinker, and you have higher AC than mundanes, great Strength score that's only going to get higher (divine power), and even you're weapon drains an extra 10HP per hit on top of a bunch of other stuff negative levels can do (make wights). After you're turn, you're better at offensive tank than a Fighter is. It's just, unlike the Fighter, you can stand around singing Blasphemy while your Hydra army teaches Pelor why his churches shouldn't advertise where they are built which is just so much damn cooler than walking up to people and stabbing them.
Edit - Speaking of Blasphemy. Holy Word all by it's self is better than entire characters. Classic concept is good vs evil and Holy Word amounts to your entire party takes another turn.