I got some constructive feedback with examples from players such as NextToYou and Sweetheart about situations where the Performance Rating wasn't behaving as accurately as it could.
Basically, some of the tank parameters that NoobMeter used had become inaccurate, either because WG had balanced or unbalanced tanks, or because they had added whole new lines and classes of tanks, the capabilities of which and whether they are overpowered or underpowered at the time of adding were unknown, and needed to be estimated.
For most players that play a mix of tanks PR would still be accurate as the deviations balance themselves out - in my opinion a much more accurate rating than the alternatives. However for some who only play a "mono-culture" of tanks it could lead to inaccurate results.
So time was ripe for a spring cleanup and rebalance. With the help of my good friend crux2005 and already mentioned NextToYou we reviewed the parameters for all tanks and made a number of adjustments based on available information from a number of sources, some of which weren't available when NoobMeter was initially created.
As a result, the expectations on the following tank classes were on average lowered: t10 TDs (significantly, especially JgPzE-100 and FV215b (183)), t9 TDs (significantly), t8 HTs (slightly), and most SPGs.
The expectations on the following tank classes were on average raised: t10 HTs (slightly), t9 MT (slightly, with exception of T54E1), t8 MT (slightly), and some other lower tier tanks (in nearly all cases slightly).
As a general rule, TDs are still expected to do more damage than HTs and MTs, and SPGs significantly more damage than tanks of the same tier.
What does that all mean?
The database is being recalculated right now. As that is done during today, your PR will change, in most cases very slightly.
The general rule is that if it goes up you have to post on the forums about how PR is the best rating ever, and if it goes down then you have to go on a rage about how it is all a conspiracy against you personally and how the changes were not needed. :)
After that all settles, I hope we will be left with an even more accurate rating to assess player skill and performance in World of Tanks.
As always, if you have suggestions or questions about www.noobmeter.com or the Performance Rating, please remain calm and contact me either commenting on this blog post, or sending me a private message on the forums (username NoobMeter), or by posting in one of the main NoobMeter discussion threads.
Thanks to all those who already do so!
Enjoy your tanking!
P.S. Stay tuned, I have some interesting features for NoobMeter in the works and hopefully launched soon :)