RNG is bad for games.
This game is 90% RNG, and it's awful because of it. What's fun about having a number generator decide on a coin-flip if you win or lose? It's the same thing in Hearthstone, posture as much as you can around RNG so it's in your favor vs against you. Me taking 2nd because my Opponent has 3 lvl 2 legendary champs and 7 completed items vs my 2 level 1 Legendary minions and 5 completed items isn't fun. No one enjoys losing, but knowing that someone beat you simply because his virtual dice rolls were better sucks. This reason alone is why I don't play TFT, i'll play a game or two every patch, and it's the same RNG riddled garbage all the time.