Here's the thing - I know I'm crap and have the micro skills of a tortoise, but in vCoH I could keep bikes and jeeps alive longer than *both* M3s and scout cars. Their speed / agility had something to do with this I suspect, CoH2 vehicles are strangely clunky when it comes to movement.
I know the CoH2 vehicles have more uses / upgrades (like the autocannon and being able to carry troops) but I still can't keep either alive for more than five minutes.
That's because on CoH 1 it's a lot easier to avoid engine damage on vehicles. Nobody would tech stickies against a bike, because you can kite stickies well with bikes/schwimms and stickies would otherwise delay your teching and units from t1. Also, stickies cost ammo, which most likely are needed for flamers and grenades.
Wehr faust is at t2, does not damage engines and t2 teching will be delayed until the Wehr played has fielded more than 3-4 units which will take 5-6 minutes.
So, both bikes and jeeps have a reasonable timeframe of being useful.
Here's CoH 2:
As soviet you'll train 90% of all your infantry units within the first 3 minutes of the game. After that you can just tech AT nades from your starting fuel because you don't need to build your t1/t2 right away. Since you have no ammo upgrades apart from flamers you can spam molotovs and AT nades once you've researched them.
On top of that you can get 1cp guards which are insane against light vehicles.