I just finished the Wrath Gate quest line in Dragonblight and it was easily the most amazing and intense experience I’ve ever had in World of Warcraft. I did the Alliance version and I can’t wait to do the Horde version on my Blood Elf toon. It’s amazing, if you do nothing else in WoTLK, do this chain. I’m still a little emotional over it.
Btw, The cut scene is up on YouTube for those out there who want to horribly spoil themselves, just search for Battle of Angrathar the Wrath Gate.