So, hear me out.
At 5.3 we have SUB I-II with excellent mobility and gun that has very long range and very high ROF, capable of 1-shotting any single engine prop (thx for real sh*tter 3.0, Gaijin).
At 5.3 we also have Ostwind II, which has pathetic penetration, mediocre range, mediocre ROF, bad mobility and armor that is just thick enough to trigger every APHE out there.
Oh and 37mm M-geschoss is laughably unreliable, as it oftentimes barely deals any damage for whatever reason.
We move up, and we have ZD63/PG87 which has like twice the range of Ostwind, waaay better ROF, way faster rounds that hit just as hard, it has A LOT better mobility and it somehow is only 1 BR step higher.
It’s also even deadlier vs planes than SUB I-II because it has EVEN MORE range.
WHY?
At 6.0 we have Zerstorer which has 0 armor, is huge and only has fun depression to the front, so GL firing while flanking or at flanking enemy. When firing at planes, the thing is horrible thanks to super small magazines. It’s essentialy worse than SUB I-II in every metric.
BTR-ZD is also way worse than ZD63, only winning in mobility, yet it sits at 6.0, it has worse AP capability than SUB I-II though, but lets say, it’s tiny bit better
Then we move to 6.3 - Praga has very, very good guns, over 1000m/s, great ballistics. While power to weight seems pretty bad at around 10,5HP/ton, thanks to wheeled chassis it can go very fast around most maps.
It is worse than ZD63 in every way, but straight penetration, though. 2 BR steps higher.
We go to 6.7 - Kugelblitz has some armor, but guns absolutely suck at this BR. It also has way worse mobility than Praga, fuses APHE. It just doesn’t cut it. Kugel’s HVaP is horrible and belts are kinda OK, as HVAP + 2xM-geschoss is at least fairly universal.
And I wonder, why is by far the best SPAA out of the bunch 5.7?
ZD could go to 6.3 and still have 0 competition. SUB I-II could go to 6.0 and still be one of the best SPAA around.
Why do they sit so low?
Also, other SPAAs with high velocity 20mms around the BR are also super good vs planes, but they have 0 anti tank capability, as post war 20mm API/HVAP round has like 33% of its real life performance vs angled and maybe 66% of real life performance vs flat, on top of shattering on wet cardboard.
This means they are spawned way less often, which means Yak-9K and UT do whatever they want.
It’s just bad game design.
IMO we need 2 things - BR adjustments and long needed fix for 20mm HVAP.