Blizzard hotfixed Brutallus for a very painful experience. Does that makes sense? Oh well …

Daelo: We’re currently hotfixing some additional changes for Brutallus on the PTR. Feedback on the the encounters in the Sunwell has been excellent so far, and we appreciate the assistance provided by players in testing and tuning these encounters.

– Brutallus’ health was decreased from around 11 million to 10 million.
– Meteor Slash damage has also been increased from 10000 to 20000, the effect duration has been doubled, and you shall no longer dodge, parry, block the ability. Brutallus can also no longer miss with his Meteor Slash. (Source)

Below you may watch a Brutallus kill video by Crysees @ Greymane (Crimson Guild):