Just looking through the roles...
The assassin has strength, agility and perception as his cheap to raise characteristics (x50 exp mod). Strength doesn't feel too right to me here. I appreciate that it helps him do more damage in combat, but I generally consider assassins to be extremely skilled rather than strong - should WS be used instead?
The Chirurgeon on the other hand does have WS as one of his easy characteristics (which is odd) and unfortunately has agility as one of the hard to raise ones (x150 exp mod). This is is not so good because applying first aid is based on agility/ Not sure why a doctor would be good in melee but poor at patching people up.
What do people reckon?