If you ask me, variety is what makes a good raid. You have different, unique bosses, with different, unique mechanics. Some have adds; some don't. Some send you soaring through the skies. Some have weird vehicle mechanics. And some encounters, bless their hearts, are Patchwerk-style simple.
That's sort of the niche Baleroc the Gatekeeper fills. There are some mechanics you need to know, of course -- it's not a mindless stand-and-DPS fight. There is one phase and there is one key DPS mechanic. And as far as that mechanic goes, we shadow priests are stars of the show.