The MGS were the single most problematic units during this battle. Ive tried once to take a single one on with 3 T72s. The mgs fired a round through the first t72 destroying it, passing through and hitting the second one panicking that one.
The third got a spot, missed a 300m shot and got destroyed as soon as the MGS had reloaded which took at least a few seconds less than the t72. Afterwards i stopped trying to challenge them and was hoping for my atgms to get them which they never managed.