New champ select requires less "skill"
Less counter-picking: Not able to counter-pick as much since even though I see a champ I love to counter pick selected on the opposite team (top), I'm stuck selecting a mid champ since this is my designated position + no mid has been picked on the other side so I'll probably be counter-picked. I would have never picked a mid in this situation but I am forced to do so.
1 trick ponies: You don't have to be a god at all 5 positions but this matchmaking allows people to NEVER touch ADC for example if they want which is ridiculous. You should be able to play all 5 positions and be decent at them all. With this system, someone can be a diamond mid and top player while being an equivalent of a bronze ADC and jungle which makes zero sense.
don't just pick
if you don't know how to play it you may be counter-picking yourself do to the fact she know how to play it and you don't. it best to pick nasus
if you know how to play it even if riven is a counter. but also you know how to play it.
1 trick ponies: SO what if they keep getting the role they will keep doing good and it lets them play it more. and the only reason you should cry is if you also one and can't fill or do anyone.