Kinda circles back to a re-occuring issue with the d20 game system, the huge impact of the math.
A +1 AB here or a -1 AC there could mean a reduction of 50% damage taken or adding 100% more damage you take over a battle, not 5% like the game creators probably intended.
The end result is certain classes are fractionally useful in unfortunately common situations which I can see to be very frustrating.
I tend to cringe but try to give additional respect to anyone who plays one of the more mathematically challenged classes. I know that over their lifetime, it is possible they will take 1000% more damage then my 'easy mode' character.