why do people insist that the jackson is bad? it one shots mortar halftracks, two shots stugs, and 3 shots panzer 4s. it costs 350/125, WHICH IS THE SAME AS A PANZER4. its not at all expensive for the massive firepower it can bring to bear.
It's supposed to be the USF answer to heavy armor and it doesn't do a very good job at it. 160 long range penetration is pretty meh for a unit that is supposed to fight tanks with 300+ armor. It also has a very long reload time until vet 2/3 while also being made of cardboard held together with duct tape. 480 health/130 armor means a single mistake will cost you the Jackson, and since it is useless against infantry it is incredibly vulnerable to OKW volks blobs.
Add all of this with terrible pathing and Axis tanks being naturally faster (looking at you Panther) and/or having blitz, and it is a glass cannon that seems to be missing part of the cannon.