ELI5 WoT and Math

I would guess the reason is as they said, the people with below average skill brings down their team. The average players will be 50% +-2. There is far more players with below average skill level by WN8 than there are with above averge skill level. (Basically more tomatoes than unicums).

WARNING MATH TO FOLLOW

Example: out of 200 players say 100 of them are average players with a 50% win rate. If the other 100 are 10 unicums with 55% win rate and 90 tomatoes with 45% win rate the average win rate of the total 200 people is 48%. So even though the bulk of the players are "average", the rest of the players consist of far more bad players than really good players which brings ther overall average down.

/r/WorldofTanks Thread