I know I'm in the minority, but I've always hated the entire concept of 'aggro range' in games like this. I wish that if the monster was aggressive enough to attack you with intent to kill, it should due so as soon as it could see you. In other words, if you can see it, it's probably running towards you.

It's part of what I've always thought killed the real sense of danger in these worlds. When you know that you won't be attacked unless you're X meters from a rabid wolf, well...as long as you pay attention, it's not dangerous at all.

Not to mention, this would make the <Enemy> Eluder abilities actually useful...