This is a straight copy/paste from my post on the EU forums - looking for some more opinions on MD.
After clearing all of normal mode D/soul and having a good few attempts on 4 of the heroic encounters, I got to thinking about how often (apart from the initial pull) I actually use MD in a raid environment.
Thinking back to T11 content MD was very useful on in the following situations:
1) hc Magmaw - to send the Bone Construct to the off-tank
2) ODC - sending the newly formed Golem to the relevant tank when it first activated
3) Maloriak -sending the small adds to the off-tank
4) Neffy - helping with the Bone Constructs if they get a bit out of hand in both the first and last phases. Also sometimes pet tanking the Bone Constructs in p1 normal mode for fun.
5) Halfus - very useful in either opening the encounter or sending the newly released drakes/whelps to the tanks
6) Cho'gall - an early MD on the big add that a tank would normally take to the back of the room was very handy
7) Sinestra - carefully MD-ing the whelps to the offtank
T12 content
1) Beth'tilac - personally I'd only very rarely need to MD a Spinner to the downstairs tank
2) Rhyo'lith - MD-ing the small or big adds to the off tank
3) Rag - MDing a lava scion to a particular tank
T12 content
1) maybe the small adds that spawn on Yor'shaj, although we've veered away from that idea of late.
2) The amalgamation in Madness of DW fight. But even that seems nothing more than an "out of habit" reaction from me.
Now, I know that only one tier of raid content isn't exactly enough to make a trend, but is MD becoming less and less useful in a raid environment? Is MD an ability worth saving or is there an argument to include more scenarios within raid content where MD is a powerful tool? Should MD be changed? If so, what to? With a new expansion coming, it might be worth taking starting to think about how we might want MD to look in that expansion.