Fair. I haven't been paying much attention to Str's effects on pdef; my test run was for melee attack and I just noticed it didn't seem to bump up at all/didn't notice it changed.
I think original RBF crit chance was 2% on AA's - characters could crit without option items/buffs. I would be able to believe it's 0% in R:O, however; my guard until getting a crit sword/dagger never crit. I haven't really noticed much of an effect of leveling on crit rate on my ranger. 6% on a crosbsow and 6% on EA kind of make it hard to tell, though.