I can summarize Azir for you to help you make a decision.
Fun Factor: Extremely fun and rewarding to learn and master.
Learning Curve: High skill floor and very high skill cap. Takes a lot of practice to play decently and a whole lot more practice to master completely. He's even a bit harder to get into than he's supposed to since his numbers can make him feel undertuned right now.
Carry Potential: Carries very hard starting in the mid-late game after 2-3 items if learned sufficiently. If mastered completely, however, he's an extreme hypercarry threat all game long, as long as he didn't lose lane and can get his items.
Matchups: Azir struggles a lot in many matchups against long range burst mages and assassins. If he's compeletely mastered however, it becomes slightly easier to manage these matchups and sometimes win them even. Back when he wasn't as underpowered as now, an Azir master can win a lot more easily against every matchup.
Power Curve: Weak early game but has good harass and is quite safe. Mid game is really strong with 2 items after level 9 unless enemy team is so far ahead. Late game is downright busted provided you can live long enough to melt everything.
I highly recommend you pick him up, unless you want something that can be learned quickly and is purely for climbing elo. If he gets buffed again though (which he is supposed to), he can be top tier for climbing when mastered.