My only problem really is that it's a pretty straight up +25 for a win and -25 for a loss. This makes the grind so horrendously long and to get to your "true elo." So everyone is clumped together for so long. I have a 66% winrate with 50 games played (just got to silver). If you ever had that in League you'd be at least plat or diamond after 50 games. Most challenger players have like 52% winrate but over 1000 games. 99% of the population is unranked or bronze because the grind to get out is crazy.