I hear you. At its root the problem isn't the champions or mechanics; its the attitudes of the players and the general ignorance in solo Q that makes the game unenjoyable lately.
For instance: No one wants advice good or bad. If its bad advice, that person just tilts and there goes a piece of team morale. Half of the players don't know what teamwork is and get zero satisfaction from a win unless they felt they contributed. The KDA is the participation trophy they seek over really what wins or knowing when to let yourself be carried. Then there's tilt and the ZERO willingness for anyone to help a frustrated teammate mentally. If you're losing lane, or losing jg, and throwing out pings for help or assistance and you get no response from your team its tilting af. If you wanted to play a game where map awareness and helping your mates out wasn't a big deal, you could get the fuck off pvp and not be a selfish douche. Yes, you can't save every player/lane losing, but when all you give is silence or "learn to play safe" you shouldn't expect to win. You should consider the game 4v5 at that point, or even 3v5 if you're just gonna farm around map and not do anything.
FFS at least be positive enough to try calming a teammate down. If they don't wanna hear it and are an ass yeah mute them but at least try to be a decent person before you assume they're human garbage and abandon everyone to an uncooperative loss.
I don't think people hate this game because of the difficulty; they hate that its an awesome, fun game when you feel there's a chance of winning. When games are stomps because you either got an egotistical snowball carry and other selfish players archetypes there is no close games. To have close games you need 2 teams of 5 who care more about playing than their individual KD's and chat silence to avoid reports.