Is Garrosh Hellscream the most difficult raid boss in WoW history?

[brunnor]

No Garrosh isn't the hardest at all. I have friends in higher up guilds and they are currently on him or have killed him and say that Blackfuse and Klaxxi are much more difficult than Garrosh. They almost compare Garrosh to Ra-den and blackfuse to Lei-shen.

And KJ was miles easier than Muru... My guild took 203 wipes on Muru and around 50 on KJ. Since you seem to want credentials, I am/was Brunnor/Sendaii of Crimson on Greymane - Main tank at the time as well as Guild leader and raid leader.

[gemana]

I'm gonna go with top 5 Heroic bosses for difficulty:

Lich King
Ragnaros (FL)
Yogg 0
Algalon
Spine (The most difficult part of Spine was forcing yourself to logon for another go at picking the dragons scabs)

[Sageofthe10paths]

I found Normal garrsh as challenging as normal Ragnaros. Sunwell was insanely hard... Maybe too hard. I'd like it at the end of ever xpac we got a mega hard raid with one boss kinda like Halion where it's just one boss and a tease for the new xpac.