I don't see an issue with the mechanic. If the enemies use it too often on lower difficulties it's a tuning issue. With players you lose out on loot, and you risk getting shoved off yourself. (And that's assuming the enemy isn't too heavy/can't fly and that you have enough athletics, and don't get smashed by attacks of opportunity trying to position yourself.) Bosses can be made immune to shove (and they often are)
