Instance: Gundrak
Box: 4x Ele shaman
Gear level: pre-heroic blues/greens(70 epics count as these)
Difficulty: hard(learning curve+wiping fests)
Guide: This instance has somewhat of a learning curve on the bosses, but it is very worthwhile as you get 5 badges from this place.

Slad'ran <High Prophet of Sseratus>

Have the tank fight him near the door leading to the rest of the instance. Stay at max range and burn him, his HP is VERY low! Or take your time and drop the adds that come on your tank, if you take this option you'll need to destroy the snake trap on your tank. The adds do have very low hp so Chain Lightning or something similar will also drop them in the process.

Drakkari Colossus
This fight was giving me an insane amount of trouble until I finally figured out to use a Nature Resist totem +130!! Pretty much made it ezmode.
He has 2 phases, he will switch back and forth from 100 to 50 <switch> 100 to 50 <switch> 50-0 <switch> 50-0 done.
The Colossus form is a tank and spank, nothing special happens.
When he goes into Elemental form he constantly spits out puddles of Mojo, spread out from each other and either move forward or backward every so often to get out of the puddles.This phase he also has very low hp.
For extra simplicity on this fight throw down your Earth Elementals, they are immune to nature and the boss will attack to throw the puddles at them causing there to be no aoe puddle on the ground.

Moorabi <High Prophet of Mam'toth>
Another tank and spank, nothing special. Keep your tank topped off and interrupt the transformation spell into Rhino either earthshock/windshock, if he switches into Rhino mode it's not a big deal just means more damage on the tank.

Eck the Ferocious
Easy fight, have the tank place the boss close to you, but facing away, he will do a leap ability that is an aggro reset and he just needs to pick it back up. Boss hp is low can just burn this one down.

Gal'darah <High Prophet of Akali>
Final boss, takes some practice. Have your ranged sit on a wall like SS2 did.

My tank sat on the other side which was just in range of heals and damage.
When he switches into Rhino mode the tank drags him over to your ranged dps and fights him there. Make sure to keep your tank and whoever gets impaled topped off.
For normal phase focus on being offensive, Rhino phase play defensively.

Thanks to ss2 for the tips on some of these fights