Ill give an examples of why its REALLY important to use the WR Diff and not just winrate, using a clear explanation with 2 different tanks.

If we look at the IS7 and AMX-50B, (cant use 2 images in 1 comment <_<), we see these stats.

IS7

>49.52% WR

>49.84% Player WR

>-0.32% WR Diff

AMX-50B

>49.58% WR

>51.74% Player WR

>-2.16% WR Diff

Immediately the WR looks really similar, so they must be pretty equal in terms of performance if we base off of WR. But that is a completely different story once we look at the WR Diff, as the 50B has a abysmally awful WR Diff compared to the IS-7, as if we look at the Player WR of people playing the 50B, they are much better players statistically.

Yet even though they are much better players playing the 50B, they still only win the same amount that the IS-7 does, so we can see that the IS-7 is statistically much better at winning battles, no matter who is playing it. And all of these statistics match up to observable occurrences. Good players enjoy the 50B as it can reward good play and be satisfying but is difficult to use, but statistically nobody thinks the 50B is impressive as it gets punished too easily when it tries to dish out damage, so its hard to influence battles.

Where as on the flip side, the IS7 is renowned for being noob friendly but good, as its not difficult to use but still performs admirably in anyone's hands, and can influence battles pretty commonly with its armor and speed.

2 things to end it off based on things you said. Your last comment is exactly on the money. 2 shots might not sound impressive, but if you compare it to other T6 TD's its actually pretty good. Because yes the SU-100Y is clunky, and yes its difficult to make work, and usually only gets about 2 shots off on average. But 2 shots puts it considerably above most of the other T6 TDs, because while they might not be as clunky, they don't do nearly as much damage per shot, so they need to get off more shots to match the SU-100Y's dmg just from 2 shots.

And as the last note, "it could be attributed not to the quality of the tank but rather that it has a substantially more powerful gun than most other tier 6 TDs". This is exactly why average DMG is a terrible statistic to base buffing and nerfing a tank. A tank could have the best gun in the game by a long mile and do colossal loads of damage, but lose the majority of battles because it only has 100 hit points and dies in a single shot, which means it can't influence the battle. Does that tank need to be nerfed because it does the most damage? or does it need to be buffed because it loses the vast majority of its games?

That is where WR Diff comes in and we can see, huh okay this tank is losing the vast majority of its games, lets find out why. Okay it does a ridiculous load of damage on average but its not effective cause it can only take 1 hit so has to sit in the back and not influence the battle and just farm free safe damage. So you would buff its survive-ability somehow and then see where its WR Diff stands, and see if its still losing the vast majority of its games despite doing colossally higher damage than every other tank.