Mind control duration is partly controlled by distance. The farther your 'pet' is from you, the higher the chance of breaking. Solution : Park it on top of yourself unless you have other plans in mind for it OR if the npc you are fighting has some sort of stun/cc (Shield bash/gouge/polymorph etc).
Mind control a healer if it's available. Why spend your own mana and get possible aggro when you can easily mind control that medic and use it's prayer of healing which heals for 2k+ AND uses only 400 mana over your own? Don't forget that the medic has 8k mana meaning it can chain cast it for a while, and if it gets aggro and dies...just remember that it wasn't you who just died. :P
Mind controlled npcs have their own aggro, spells cast by an npc do not get 'added' to your current aggro.
You can mind control something and let the surrounding 'linked' npcs kill it. Then fade aggro into the negative in order to dump the npcs onto your group/tank. Ghetto crowd control. Why fight 3 when you can fight 2. Leading to the next note
Mind soothe is VERY useful in getting close to humanoid npcs without them jumping you due to the 20 yard range of mind control. If you want them to focus on pet and not on you first (Remember aggro rules) use mind soothe.
Mind control damage is not counted as 'player dmg'. Meaning if a mind controlled pet kills something entirely by itself, you get no loot. But if a person in your group hits it for even 1 dmg it is counted as a player kill and you can loot it as normal.
You can mind control something and have it die, but you will recieve no loot for it. Instead let other npcs beat it up to 5% or so, then break mind control and one shot it to gain access to it's body.
Shadow Affinity and Shadow Focus affect the duration and aggro gained from mind control. If your into heavy controlling both are highly suggested to make your life and group's life easier.
Mind control can break early even if channeled bar is still somewhat full. A break is checked vs level/distance/resistances of target every x amount of seconds.

What mobs are worth Mind-controlling, and have good abilities?

Dire Maul North

Gordok Brutes - Very High dps/stun/knockback/high hp/tanks very well and can keep aggro
Gordok Warlock - Banish (Can banish anything)/Curse of tongues/immolate/shadowbolt
Gordok Reavers - Cleave/mortal strike/armor sunder/high hp/good tank
Gordok Mage-Lord - Frostbolt/60% 30 second haste buff/flamestrike
Gordok Captain - Instant shadowbolt attack/fear/high hp

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