Its about buffs , debuffs. I would like to see addon which will show me what buffs and debuffs i dont have active . That way i will receive direct instruction what spell to apply. It would mean that addon should have "buff/debuff always on in combat" option and if that buff/debuff is not active it will pop out as information to player to apply it.
Thanks
Note : it would imply that addon recognise pots and food as source of buffs and can make distinciton between pots/food.
Did you try the given addons already, like S'rendar? They show you the buffs that are active (long term, short term buffs, food, etc.).
You won't be able to see all of the enemies buffs as the game is not providing all information though.
My one and only addon notifies you when you forgot to self buff (if that self buff is on the Action Bar)... but I don't think it's exactly what you're looking for or extensive enough.