Most nights, my auto match queue seems to be populated by 20-40 people. It sure doesn't seem like a whole lot for me being in North America (Southern Ontario, Canada).
It also lets vetted SU-85's or an ISU-152 go head to head with an Elefant. Which is great, considering Elefants are a very common hard-counter to SU-85's. The Mechanized Support commander has awesome synergy with guards + mark + isu + bombing run.
Its been shown that T34s can still Ram even if the engine is dmged after the Ram is activated and before impact.
Blitzkrieg also works with a damaged engine. Both issues should be fixed. Although, I am guessing that fixing the "in-progress ram with engine damage" issue will be a harder programming problem to resolve.
It causes units to deal 50% more damage to the marked vehicle (note that you still have to penetrate its armor) and a recon plane will periodically fly-by over the marked tank granting limited LOS (but not as large as an actual recon plane).