Should get plenty of mez practice even in crushbone. Besides the multi mob pulls,you'll also be dealing with a lot of people that aren't assisting properly. They'll break your mez and the fun will be increased!
Keep root loaded too because they probably haven't split up their chat windows from combat spam yet either. As such it'll take them roughly 180 seconds to pay attention to their group window after 2 pages of spam telling them to switch target. Expect a belated "sorry guys my bad" 3 pulls later when they get around to reading.
If you're grouping in a spot like crushbone wall with good visibility around you, go ahead and follow the tank out a little bit from your camp and mez incoming mobs before they get close enough to the group to begin with. Alternately just root them a distance away.
Keep your AE stun loaded. You should have your best AOE stun loaded at all times (in some situations, you'll want more than 1 loaded, but always have the highest duration one loaded at a minimum). If something breaks root/mez etc, stun the mob, walk away a little during the spell cooldown time, then CC the mob as soon as the cooldown is done. This is applicable for charm breaks too. Careful not to break any other mezzes you've already cast though, since the AE stun will hit any nearby mobs you've mezzed already. Get comfortable with the range on the AOE stun because if you aren't used to using it, it's larger than you think and once again you'll end up goofing up and breaking other mezzes you've cast. Ditto when you're using it to interrupt a caster.
If you can stay alive while CCing in a low/mid level dungeon, you're ahead of the game since the higher level you get, the larger the percentage of people you'll group with that correctly assist.
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