So, when people always said" Warhammer is grim & gritty, you don't start as Fighter or Wizard but as Ratcatcher" it actually meant "Rat Catcher is really powerful in Warhammer"?
From my experience, I think skills like Dodge Blow is no less important than Resist Disease - in fact, it might be more important.
Rat Catcher is a good starting career. As far as skills go, it depends on your game and your GM. I have run games where combat was the last resort, where the players did a good bit to try and NOT get into fights (even the ones they could win)! Stuff, like going for the guard instead of charging into a warehouse.
Maybe it was just my players but I have a house rules "that only stupidity kills PCs" and "heroics are rewarded."
I also have random sickness (bugs) that maybe running about town.