Okay, couple of things
Can you seriously bronze - diamond que now that sounds broken?
Also trust me, 1 person can not carry 4 shitters to a rank they dont deserve, its hard enough to carry 1 person sometimes.
Though elo boosting has always been a thing, and will continue to be, I wish It wasnt but it is.
As for 4 being a dick to 1, I just mute, normals etc always mute the first sign of flame. At the end of the day that group of 4 needs you. If they are intentionally trolling you they dont want to win, and honestly thats not that different from 1 person trolling in this game. (Greatest example of that is the plethora of disco nunus keeping Gross Gore out of master.)
BUt I do think that
They need to make it so that only groups can que against groups. 5 mans can only get other 5 mans or maybe a 4 + 1. That might not be good enough right now I dont know.
Keep it like duo q, can only que like gold with a plat, not plat with a bronze.
Keep those 2 rules and I think it will be (relatively) okay. I can see the complaints tho.
I played 5 games of the new champ select today, 4 soloque 1 duo q. Plat 4 elo. Nothing seemed different. The game was a game. I dont know if i was playing against 5, or against 4 or if the other 4 on my team were all together.
I just played the game picked some OP Champs ;) like Kindred and Graves jungle, carried every game. Communicated though pings. Everything was fine.
Didnt even get to try the multi person, and I did have a small sample size.
But Im willing to see how it goes for a while to see how the system gets fleshed out. And If reddit comments are true it needs improvements.