How accurate is LoLKing/na.op.gg
I am curious to how "accurate" these two websites are. I just got out of a bad game, I admit I did bad but the guy who we played against first pick jungle and forced our jungler to be mid. He claims he did it so we wouldn't have lost as fast but the guy failed, ganked maybe once, did this and that. Regardless, he claimed most to all of us are "boosted" and our "ELO/MMR" is lower than it should be. Both these websites say I'm 4 points below the "average" to where I am. I really don't get the point of these websites, I mean I look at them to reconsider my build options, waht went wrong, what my AVG CS/KDA and etc but anything more than that. I thought Riot was the only ones who know my true MMR. I really do not think the guy who should have gone jungle would have done so bad, I mean everyone has bad games and most of us had him muted but we totally reported him so we all hope he gets his just dessert but it is a mere curiosity to why people use this websites and be like "Oh hey shit mid incoming" and try to make everyone tilt right away. Hell I've seen people have bad stats and then do well mid/late game cause of everyone else's influence in the game. I don't get it. Can someone explain please?