tommies are shit vs this guys even in cover if they rush you. I kind of tested it. The OP troops arrive with 3/4 hp even sometimes loosing a guy against full hp tommies, and they still kill tommies.
The Bren Carrier, I haven't used it, but it looks pretty weak right? I have used it once or twice. It looks like its accuracy is too low. And that leaves me with 1 less unit to capture with. Plus this thing is not bullet proof.
Sturmpioneers (The Elite sapper one) excel in close-medium range so take long-range to your advantage. Try to avoid close-quarter area (Veto some maps out, I can't truly remembered which are worse for Brits so you have to figure it out yourself. Each time play is a learning experience, heh?)
Usually use the first IS squad to rush key-building then move your mg up. Don't too worry about capping back points yet, just lock that key positions (Either fuel point, cut-off or VP) and cap the back points later (Or you could just ask your teammate if he isn't Brits).
Also, OKW player usually can't get more than 2 Sturm squads (2 would already be 600 MP investment and it would bleed him a lot) so again, long-range is your friend. Right now, OKW overall is actually weaker than they used to and struggle a lot in 2v2. Pay attention to what tier he choose:
- If he go the Medic HQ, his lack of light vehicles would be his downfall. Your IS with Brens will make a short work of killing the OKW infantry. Rush for a Cromwell (Centaur could work but against infantry only) as early as possible and you are good to go!
- If he go the Mech HQ, then expecting an early Luch. The best bet is to get the AEC, but if your fuel situation isn't going well then AT gun (Always need AT guns for late-game).
Since it's 2v2 we're talking here so remember to always try to get a mortar pit up. That consistent MP bleed towards the OKW player would basically kills him.
A side note: You seem to be new here so let get this straight: When you lose a game, upload it here and ask the strategists here for help. Those guys make take some time to get to your gameplays but when they do, believe me, you can always trust them! And unless you're not sure about this unit vs that unit or the stats and such, etc. (Which you seem to not know much when saying Commandos and Brens-equipped IS are weak against Sturmpioneer) then don't state them OP or anything of the sort. You're only embarrasing yourself here. Come here with the idea of you wanting to learn and improving your gameplay and you'll get what you want.
EDIT: Oh you haven't try the UC yet? Then try it now! You might think that its accuracy and survivability are not great but it's a vehicle! You won't get MP bleed when using this thing, while infantry can drop models and lead to MP bleed. Again, each time you play, consider it as a learning experience, try out new things, new tactics or could even be just a strange idea of your own! But still do your best! If you lose, however, then ask for help.