I've been trying to get Baron Geddon's left binding for 60 weeks or more now.
Ever since blizzard lifted the requirement that you needed to be in a raid to enter old instances, I've just went straight into MC without bothering to be in a raid.
Then I just read this from wowhead.
"To get that to drop, your status must show you are part of a raid, even if you are the only one in the group. I usually have a friend party with me, I switch it to a Raid, then once I am in, they drop off the group."
That is ridiculous. I've wasted so many tries...how was I supposed to know? That comment was only left 6 days ago.