Sadly, it's true.
Since you left, they've added even more badly designed champions whom everyone hates, and now there aren't enough ban slots to keep them out of our games any more.
Half of their reworks have made the reworked champion even less healthy.
The power gap between the S-tier champions and normal champions has grown even wider, and often it feels more like you win because of which team has the champions that are the most forgiving of mistakes.
It also feels like mechanical complexity and APM has become much more important compared to strategic depth and good positioning/planning.
The new mastery system has introduced tons of damage or free power to everything and now helps champions overcome their designed-in weaknesses.
Their itemisation reworks have been extremely hit-and-miss. Marksman can just rush attack speed (usually Hurricane) because the Fervor mastery makes up for lack of AD. Mage itemisation is terrible right now because everything has CDR and defences on it, so mages end up half-tanky with perma-slows due to the buffed Rylai's rather than being fragile damage dealers.
The community is as toxic as ever - probably more so, especially right now at the end of the ranked season.
People flame in almost every game. At least one person on the losing team of almost every game is constantly asking for false reports. Other times, people give up and leave or start to troll after the slightest disadvantage.