The lack of 60 range will make it very hard to use against good players because AT guns will be able to drive it off extremely easily.
use some infantry to spot for AT guns
2 stugs with target weak point and a pak or p4 are not that bad. You can target weak point a tank several times and with the buffed pen it is even more better.
I used the stug in Alpha a lot of times, but when you get flanked = rekt