They aren't any more op than button + mark vehicle combo. Tbh I would say that button + mark vehicle is much more effective since mark vehicle increases received damgage by 50 % while button makes the vehicle basically unable to move.
Wow...60 Muni for a crappy LMG
45 Muni for POTENTIALLY (not guaranteed) 10 second button
80 Muni for Mark Vehicle
Grand total 185 Muni. POSSIBILITY OF KILLING 1 Vehicle with it.
Andddddd Stuka can kill more for around the same price....so yeahhhhh.
Mark Vehicle I can see why people would QQ about it. Its powerful. It makes Soviet AT equal to German AT. Kind of like what the Officers buff does to the German infantrys AI.
But button? Really? Come now.....