2 Ostruppen squads are the same cost as a conscript, stronger than a conscript (between them over 120% of the health, 80% of the DPS out of cover, 160% of the DPS if all models are in cover), and they can have one unit hold a building and another cap a point at the same time, or cap two points simultaneously. It's especially problematic on Semoskiy because there are so many buildings, and controlling buildings is a key part of the map.
I think in my Ostruppen whine thread Von Ivan posted some tips on how to play Semois against an Ostruppen spammer - sending your first engi to get the house by the fuel for instance. Those may be helpful if you're struggling against it on that map.
Yes, you're correct on the numbers according to the DPS chart values. The Ostruppen shouldn't be faced with a one conscript squad out in the open. Using molotovs will even the odds so you can't go off pure DPS or HP values. The Ostruppen lose DPS quickly because they get dropped pretty fast. Conscripts with PPSH's or elite infantry have no problem taking on Ostruppen. The annoyance of Ostruppen is when they get mixed in with higher value infantry. This makes it tough for a Soviet sniper to do any meaningful manpower drain on the enemy if you're taking out units only worth 10 MP. I'm not saying that Ostruppen are perfectly balanced at all, it's just they seem to be decently balanced for them being added (I know that relief infantry made them obtainable in the past) fairly recently.