this fight gets trolled hard. no such thing as a good troll. Thankfully, if you do this LFR on Tues/Wed, you have a chance at having a group strong enough to ignore the mechanics and burn down the menders without any CC... but it hurts... a lot.
I am talking about the very first trash pulls when you get into the instance, with a normal 10/25 group you would CC the mobs that break the tanks shields is a 4 stacking debuff 25% armor each and it hurts.
In LFR most of the times somebody makes one step forward and pulls the trash, I've even seen warlocks put cookie things further ahead so people start moving to get own by these mobs. -- Judge a man by the trials of his shield, not the empty reaping of his sword.