I'm not going to jump in and say who's right and who's wrong but give my perspective to tests and video comparisons.
Here's something I copied from someone else. They made multiple videos and possible different configurations. So it's better to have multiple angles and it will shut down arguments since it's on even playing grounds:
from this thread:
https://www.coh2.org/topic/46337/panzer-grenadiers-are-worthless-without-shreks-upgrade
I watched those videos and fail to see how they are any better than sirlami's ones? His ones at least had a variety of ranges and cover situations, but were always on equal footing too. Basically I don't understand your point. Please explain again.