This Thing You Call Aggro.

[Skandranon]

Though players do have this option, let's look at the classes and what they're effective at. I believe Warlocks are in a position natural to dissecting the entire battlefield.
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Hm. I wouldn't agree with this statement. Your concept is that the class which needs to split its attention most and engage the greatest number of targets is best suited to seeing the battlefield and the situation as a whole. I'd say the opposite - that classes that need to split their attention so much have the least amount of extra time to devote to watching the battle unfold.

Warlocks have so much to do that their time is invariably better spent hitting a button or checking on one of their targets for a debuff icon. They engage all the targets but do so in a limited fashion, as there's always another target to check or another spell to cast from either their own bar or the pet's. Healers are fixed on the party's life bars, tanks have to hold aggro on targets and rogues are too close to the action.

I would say that the classes which require the least constant attention are best suited to taking time to look around and grasp the situation. I'd say hunters are some of the best at this: they have good range and only engage one target at a time with damage. With distracting shot, disengage and feign death, they are also one of the only classes with the ability to modulate threat both up and down, which represents unparalleled control over what's attacking who. However, I'd say that mages are fairly decent at it, too. After checking on the sheeped target, all a mage has to do is cast on the main target, which generally freezes the mage in place for some period of time. I frequently whirl my camera angle around in a circle while I'm waiting for something to cast, which lets me take in what every mob and member of the party's doing.

That said, I do think it's primarily a player thing. Class attributes can help or hinder, but attentive players are attentive players no matter what class they're playing.