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I don't see anything in the Combat section of the FAQ about positional and area attacks.
For me, these add far more interactivity to combat than some abstract Block and Parry mechanism that is usually only represented by a floating word or maybe a sound effect.
Combat in general needs to have actions and moves with very visible, very understandable results. If I can't watch combat on the screen, in the game world itself, and tell exactly what's going on, then your combat system is a failure.
If I have to read the chat window spam to figure out what just happened, I will not be playing your game for more than a week.
But back to positional and area attacks. Abilities that require you to move your character around, or to choose the best ability for the position you happen to currently be in, add just the right amount of player interactivity to keep the battle interesting without straying too far into the Kingdom of Twitch.
In my opinion, City of Heroes has the best combat in any MMOG. (It is, in fact, one of only two things the game does well.) If you haven't played it, you are shooting yourselves in the foot as developers.
EDIT: Auras and AOE toggle buffs/debuffs would also fall into this category!