It's pretty ridiculous that when I'm trying to go across certain places I get locked on by 5+ mobs without even being able to see them first. 

I get some things should lock on off screen, but it seems like almost ever mob locks onto you off screen which makes the game so much less enjoyable for Wizards.

What area are you hunting in... Mobs should not target w/o line of sight unless you left the area and came back within a couple min. I can dbl check the los range

I wasn't hunting anything, but I'll be wandering and random mobs will come from off my screen and attack me.

It's really bad around the Ice Cavern Pass and Giants Pass.

White Wolves and Goblins will lock onto you from what seems like a mile away, same with Black (Or Dark? Can't remember) Knights.

I can't really explore without have a million and one mobs on me at a time. 

Really closes off the world to me.

the range aint that long, check your minimap, as soon as you can see mobs there, then they can spot you, if they have a clear line of sight.