What in gods name are you guys now speaking about? Mortars didn't really got a nerf, they got buffed damn hard with the garrison damage increase. It made most flame abilities obsolete. Units that really sucks are leIG18, because of no existing area damage, so don't speak about mortars.
Let's make a test about Vickers op-ness. I put my hand into fire, I won so many games only because I got one Vicker into my hands as German, who needs Obersoldaten or LMG42 if you can have a sniper-mg?
Comparison DPS:
Range 5/15/30 for me relevant ranges because of importance.
Vicker:
33.3/24.7/14.2
MG34:
12.5/10.6/06.1
MG42:
28.2/23.2/12.0
At 30 range it makes same damage as Obersoldaten lmg34. It makes more than double damage e as MG34 and because of any interesting things it kills every garrison and ignores cover.
Don't forget Vickers isn't influenced by suppresion as Maxim, it will shoot and shoot and shoot.
If you say it isn't op you use it wrong. Pinning isn't the way to win. Kill the enemy instead.
You know incendiary rounds on the mg42 and 34 doubles damage, right?