A game mode where you can't see the enemies health bar.

While not knowing how much enemies health is left, it sure is to change the dynamic of how you play against them, making it more 'realistic'? I watched this; https://www.youtube.com/watch?v=IAeNAaeYHKY and was blown away by how much damage the hero could do, giving it a more realistic feeling to the game (chunk, chunk and your dead), then my thought naturally led to this. What do you guys think?