Think of it otherwise: no other faction gets solid mobile AT that cheap. Im excluding su-85 as it lacks penetration and is even more disadvantaged by blitz ability due to lack of turret.
Dont throw the SU-85 under the bus just yet. Su-85 has better long range penetration than the Jackson at no vet, great accuracy, the ability to spot for itself, and very fast reload with vet also make the SU-85 somewhat viable in the game.
Jackson could get more penetration, especially with HVAP rounds, but...
Soviets have the all mighty anti-all mine, which CE's can place and be easily replaced if they die compared to the m20, which is risky to place mines where needed. Actually, i would appreciate the Jackson more if USF had some sort of light mine that at least slightly slowed down the enemy...
The biggest offender for the Jackson could be its mobility, but i would think it would be its health. No other faction has to rely completely on an AT option that gets slaughtered as easily, especially in the volk schreck meta...
There would be ways to make the Jackson look better without actually touching the Jackson, but we'll have to see what Relic does to the meta...
Something that costs more usually means there is more bang for its buck, and the reality is, 10-30 fuel more on a Jackson isnt really going to stall USF's ability to make it. Its does not have that big of a degree of cheapness to be considered advantageous for its lower price.
Realistically thinking, im not expecting any changes for it, but given USF design and AT effectiveness and availability compared to the AT of every other faction, the Jackson isnt *that* great.