Every so often raid content receives a round of nerfs whether it be incremental, a flat percentage, hotfix, removing abilites or changing abilities. Which boss do you think took the biggest blow from the nerf bat?
In my opinion it was Al'akir on normal mode:
Nerfs:
Acid Rain doesn't stack
Electrocute now pulses every 1s (up from 0.5s.)
Feedback duration increased to 30s (from 20s.)
Health, damage, and Wind Burst damage have all been reduced 20%.
Lightning and Lightning Rod recast time has been increased.
Lightning Strike friendly chain damage has been halved.
Will no longer use Static Shock on normal difficulty in phase 1 or phase 2.
I remember doing this boss with the worst pug I've ever seen and we one shot it (after the nerfs). Atleast half the raid would get caught in the tornadoes during phase 2 but nobody died until the last phase (which was doable with less than 5 players anyways). I mained a healer in Cataclysm so I thought it was pretty funny, there was actually nothing to heal.
Honorable mention goes to heroic Ragnaros, but even though he got nerfed like 10 times (lol) I still considered him a challenging boss at 85.