I think it is common knowledge that ranked is trash , especially on EU and NA as Koreans hate and harass one-tricks/throwers/wintraders etc . (which I don't condone) another problem is that the lack of a fixed meta means that players who play "troll" heroes aren't kept in low ranks.
Another issue is stacking and how it is stupidly effective for example I had 2 accounts on Xbox in the 3200-3300 range I play support on both I then 3-stack on 1 account which reaches 3535 in a weekend the other on which I solo queue (this was a week later) on I end up 20 SR higher with the same amount of playtime and similar stats each game. The ease of stacking leads to a lot skill disparity when stackers go into solo queue.