The Su-100M and the Su-101 (or Uralmash-1, that’s the name of the factory) have a rear-mounted superstructure housing the main gun like the Jagdpanther 2 has. This design approach has its own advantages like better centre of gravity and thus maneuverability. It allows a long and heavy gun and thicker frontal armor on a medium tank chassis, the crew can bail out in cover through the stern door of the vehicle, you don’t have to be afraid of driving the gun barrel into the ground, etc. Wiki sums it up nicely.
The mobility is maybe the only strength of the vehicle
This is the level of a really fast and agile medium tank. The Su-101 can keep up with any medium, it can escort them through position-rushes, flanking and exploitation maneuvers. Maybe it’s too mobile because it felt like it had ice skates instead of tracks, but that could be the work of the new physics. The turn rate of the Su-101 is excellent, nothing sort of a T-50 can circle-strafe it without tracking.
The terrain is our enemy in the Su-101. Every little mound can rob us seconds from our precious aim time, and there are a lot more of them in 8.0. Fighting on hilly terrain is just plain torture.
The gun depression is mere 2 degrees (the JP2 has 5). The elevation is good, we can pose as an SPG with that 18 degrees. The horizontal gun movement is also limited at +/- 6 degrees (Su-100 has 10).
How bad is that?
Well, when Super Pershing at its usual snail pace and at 200 meters can move out crossways from our reticle before we can focus on, it’s that bad. The short by Russian standards aim time does not help much. And we still have the penetration problem (for sentences like this thinks Google that we are a porn site). In 8.0, 219 avg won’t deter a frag-hungry T-54 or E-50. An ISU can hurt everything badly, the guns of the Ferdinand and JP2, the American T28s and the French AMX AC Mle. 1948 are feared and respected, the Su-101 won’t be. And this is the top gun, a joyful grind with only 175 penetration awaits! If only the never-used BL-9S of the ISU-152 was available but no.
Did I mention the 1200 per each projectile cost and the limited, only 36 rounds of ammo load? This TD can make us broke, we will be lucky if we won’t have a loss per each battle on non-premium account. This tank is a goddamn credit and free-experience sinker.
It burns a lot
We have a mere 320 hitpoints alpha strike with medium tank-like rate of fire. That doesn’t sound so bad, but when paired with only 990 hitpoints it’s obvious, that we will go down fast in a peek and boo fight. A Ferdinand or E-75 can two-shot us, any penetrating hit through the front hull can destroy the front-mounted engine or lite up the whole tank, so literally one round can knock us out from the battle.