LOL Becha you were there for the Tormentor 15K update protest as well hehehehehehe.
We have a pretty sweet group of guildies and have never had a problem with Thunderhead keep. easyiest setup for victory that I have found is the following
2 warriors
2 rangers
2 monks
2 necros/ele/mes
Basically when you get to the keep itself you split in 3.
1 warrior/1 ranger/1 monk @ each door. Ranger trapps the hell out of each door. Warior beats on anything taht comes near the door. monks heal them.
The ele/necro/mes stay in the middle and support each door with nukes/ minons etc.
Keep the king up on the stairs as he is not infused and will die pretty quick with Mursatt around.
Also Pray that the monk mursatt boss doesnt turn up.