I probably spend the same amount of time going through analytic websites than I do playing the actual game, it's out of memory and looking at trends, etc.
But, just as an example, take a look at the jungle win rates on champion.gg and lolalytics.com and sort by jungler. You'll notice that roughly a third of junglers are above 50% win rate.
Instinctively, you'd think that half of junglers should be above and half below, right? Each match has two junglers, one will win, the other will lose, and these websites try to capture ~95% of jungle picks, so the 5% of picks that aren't being shown won't change the balance. When looking at other roles, you'll notice that the split between champions above 50% and below 50% win rates is about half**, as expected. But that's not the case in the jungle. Going back 4 years, I've never seen this happen before for any role. Even when there's some significant meta disturbances (pre-season patches, class updates, etc.) the ~50/50 trend for champions in any role has always held. This anomaly actually started at the tail end of season 6, but I didn't think much of it until the first pre-season patch hit and the imbalance became much stronger.
There's something weird going on. Like any sort of information from these sites, it's open to interpretation. These are just numbers. Making heads or tails of them is the hard part. For me, I focus on how win rates for in-meta junglers didn't change very much (save Ivern) but win rates for non-meta junglers fell by 2-3%, for the most part. The quirk here is that if you have all these champions that have lost 2-3%, where has that gone? I think it has to do with a general flight away from non-meta picks to in-meta picks (as evidenced by the disappearance of at least 4 junglers from tracking), and that has tempered the win rate gains in-meta picks.
**Actually, a bit over half for the other roles, but this is normal. I assume it's because there's some really awful picks players are making that aren't being captured because they're too rare and those are all losses.
What you're forgetting is that there's a reason I'm being put up against low skill players: I am one. If I had the skill necessary to overcome the deficiencies of my off-meta picks I wouldn't be playing with and against these shit heels in the first place.