In general though I agree with OP that it is a decent map. I also belive people complain way too much about maps in this community.
One thought is:
Most people like to play a certain build every time. It is the meta for them and is the strongest they can be. Some maps force you out of your comfort zone and you have to come up with a different build order. If you really care about your rank you get pissed because you lose a game or two trying out different builds until you find the one that works for that map. So its all open rural maps from now on. Get used to it
That said, Westwall seems to be large enough to flank and open enough so the CQC units are not OP. So I would assume players would like those aspects.
Maybe it is too open? And it has a stigma attached from the cutoff buildings? The high importance of the cutoffs would also force a lot of action in the middle VP, which would also be good for snipers. Less flanking and plenty of targets?