I was curious why there are so many people that complain about max decks in siver, i looked at a few accounts and this is what i found, see screenshot, it seems that some accounts only have 2 or 3 max level summoners and can win with those with the right rulesets.

All other matches they play with lower level cards or not optimal teams for those ruleset and loose, that way they stay in silver and silver players keep seeing these max level teams in their league.

Not sure what can be done about that, but i hope that some see this and use this info to reach a good decision.