only good one is at nade cd and maybe line of sight behind cover (even tho they will have more with september patch)
removing panzersherk is a bad idea imo, first they only have 1 they need 3 hit just to kill a ir halftrack if you didnt figure out that your shit is under attack that your fault. second, they are partisans so they dont survive that much and still cost a tons of pop and mp for a ostrupen squad of 4 mens with no anti infantry power
The power is not to solo units, it's to pop out behind one's that just escaped, at which the 120 damage is usually enough.
I will ALWAYS support a move towards proper planning and ambushing over 1 click and profit type abilities. A free upgrade from ptrs to Shrek would only mean you need to ore deploy and ambush instead of pop and kill as needed and that would be a good change and a change very much in line with the way infiltration units as a whole seem to be moving