Best instance imo. Nice epic length, the concepts were new and interesting (who can forget the suppression rooms?) topped off with an epic 20 minute fight with a *dragon*. Fun times.

Nefarian has vowed to crush Ragnaros. To this end, he has recently begun efforts to bolster his forces, much as his father Deathwing had attempted to do in ages past. However, where Deathwing failed, it now seems the scheming Nefarian may be succeeding. Nefarian's mad bid for dominance has attracted concern from the Red Dragon Flight, which has always been the Black Flight's greatest foe. Though Nefarian's intentions are known, the methods he is using to achieve them remain a mystery. It is believed, however that Nefarian has been experimenting with the blood of all of the various Dragon Flights to produce unstoppable warriors.