Apart from Beth'tilac - I haven't seen what being on the web is like, so can't completely rule that out - the Firelands raid hasn't impressed me visually all that much.
This week, however, the orange finally got interesting: Alysrazor is a fun and fiery fight, not only in execution but also in looks:
Not to mention, Alysrazor drops one of the cooler-looking weapons I've seen for awhile; I really wish Blizzard had kept dual-wielding 1Hs viable for hunters, not just because of the loot potential but for looks as well.
...Can you tell I've been investigating transmogrification a bit lately? :P