I find that Ostheer can play aggressively and stop Brits from setting up. As AeroHank has said, if you build defensively don't be surprised if the Brit player is building defensively as well.
I noticed OKW players have the hardest time, simply because they keep getting 4-5 volk squads and wonder why they can't kill a bofars as easily.
Off-topic, do OKW really have any other choice? They have manpower and they can only pump two infantry units for say 10 or so mins. Volks can only destroy emplacement if you upgrade them but that also means you are risking 250 manpower + 90 munition. Luchs can't stand bofors and one stuka will take ages to destroy it. Medic truck does have a counter aka LEIG but then again, 2 mortar emplacement can take out LEIG without vets (Bcos of the range). I know, that if you vet them up (LEIG), they will eat emplacements for fun but early on it is a struggle.
I do not know why the removed jagdpanzer from the medic truck. That tank could have sniped emplacements and okw could have had more option to choose from.
I might be wrong (or not) but at present, okw can only pump sturms and volks and pray LEIG can actually do something. Unless you rush luchs and stop them from building emplacements in the first place itself. But that fortification uk commander allows IS to build...so yeah. Bofor will hit the field first.