Hello Guys!
so I've been testing a lot of this awesome tankhunter. So first what i've noticed,this tank is hard to penetrate with shermans,t-34's,su-85 and also jacksons shot 1 of 3 got bounced. against su-85 its like 70-30% that jagdpanzer would lose in 1v1 with su-85. I had 7 1v1 against su-85 tank,and only 1 time su-85 won that fight. Against infantry this tankhunter suck,as you can guess 
I play with it only with a heavy tank in front!!! like KT or maybe a panther. I use to make jagdpanzer my first tank unit,and i play it as a mobile AT gun. But maaaaaaan,when this tank gets vet 3,its unstoppable!! almost every shot fired at him,bounces )) of cource if the shots penetrate,it need 2-3 shoot to die. Last game I made 2 jagdpanzer in 4v4 game,annihilated 4 shermans and 2 IS-2
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So tell me plz,how you ppl use this tank,or dont use and why?
Jagdpanzer suffers from a similar problem with many units in this game, It is overshadowed heavily by something more cost effective and or universal. You have to change your unit comp slightly to have a Jagd P4 because it is a mobile AT gun on steroids and just as cumbersome. The reason you dont see them much is because shreck blobs are more effective and with that you can skip the med truck and go strait into the Flack truck. Its arguably the only useful unit in the med truck but Healing and forward retreat point is pretty well worth it.
As for your issues with penetrating Shermans, jacksons, and SU-85s you must just have terrible RNG. It destroys anything that isnt a kiting Jackson or heavy tank (exceptions being KV2, KV1, and KV8, you'll beat these every time).
Vet3 on just like other OKW units it becomes almost laughably powerful