The problem with azir, especially in low Elo games is the fact the games are so snowbally that he doesn't get the chance to reach his hyper carry state.
The higher up you go, the more people know how to stall out a losing game and how to make picks.
Ultimately I feel that one of the biggest changes that have caused this, isn't the mysteries or new items, it's the absolutely terrible and rediculous changes to vision. You can no longer ward defensively if you're behind, because if the enemy gets into your jungle and moves their pink wards in, you're then unable to go into your jungle for 2-3 minutes and even then, going there to place a ward could mean game over. This is worst change they've made, I just hope they realise how much they messed up on the vision changes