Here is replay of usf using this kind of tactic with Howitzer Motor Carriage.
My opinion is that motor carriage is totally fine. It does what it suppose to do. Problem is that they can call more tanks and over popcap and you can't do anything about that

they had so many tanks in this replay and we couldn't do anything ..
I think usf should choose if they want to have tanks for anti-infantry/anti-tank or shermans not all of them plus at plus infantry :/
This might be out of the topic little bit but I think tank crew should have same pop cap as tank
I could go for double jagpanzer and plant mines but I figure it out after match