Yes. eg.
Wehr: Play defensive doctrine, bunkers, Stug Spam
Pe: offense of course, Panther battlegroup
USA: offense with indirect fire, M10s, Sherman 76s.
British: Play defensively/turtle
dude...you are way off
wehr: why play defensive if offensive usually wins more games? Agressive (double) mg can be a gg in less then 10 mins...stug spam? Defensive doctrine? Don't think so...
Pe: I agree with you only on this one, offensive play with G43s, ACs and later PBGs is usually enough vs US player
USA: Indirect fire meaning what? Mortars? Hope not

USA is all about early agression and flanking and then adapting to wehr...if he goes t2, you go t2 (wsc)...if he goes t3, you go t4 (if you have the fuel, of course)

etc...
british: play defensively, turtle?! Never! I always play brits offensively and never build any emplacements! you never wanna do that in 1v1, trust me, they can be so easily destroyed, but cost lot of manpower, time and pop cap.