I just play ARAM now, it's less toxic than ranked.
In general, League is a frustrating experience because it's basically inevitable that even when you're playing your absolute best, others on the team aren't. The occasional great experiences where everyone has that synergistic gameplay and excellent coordination/execution makes it all worth it (I guess), but every other match has me wondering "why am I still playing this?" heh
edit: I know what you mean. A great League game makes it all worth it, but those seem to be maybe 10% of the games and the other 90% you are just trying to be a kindergarten teacher trying to keep everyone from going afk.