Wotlabs not updating volatile situation dating
This phenomena is perfectly illustrated by tier 1 autocannons, which can clip out opposing tier ones before the new players even can turn their turrets and react.
This sort of destructive potential allows players with relatively low skill to win an extraordinary portion of low tier matches and inflate their stats.
Top and bottom ends of the distribution were being compressed.
You can see the WN8 scale, overlaid with the WN7 scale, and noobmeter’s PR below The upshot of this scale change is that the value of WN7 isn’t really comparable to WN8, even though they are both generally 3-4 digit numbers.
This is why you won’t see the average tier term in the final equation, although the information from which tiers were played is in the methodology, in the earlier steps.
So part of the information in WN8 now includes both the tanks a player has chosen, but also the number of games played on an account.
This is because WN8 cannot capture things like timing, target priority, teamwork or decision making abilities.
As with all ratings before it WN7 had some weaknesses and limitations.
But the simplest explanation is that the Efficiency scale was not sufficiently discriminating of differentiating between player abilities.
SPGs who scout are doing it wrong (and thus their spots should be a bit lower), and their damage values can be very high in some tiers, particularly before they were re-classified in patch 0.8.6 (although they a now lower due to the DPM changes)!