Basically, what you see when you open your character profile is a bunch of numbers used for calculations, that you can't really make any sense of without delving into the formulas the game uses. Currently the only way to find out your true Crit% would be to use a parser and leave it on for an hour while you auto-attack a dummy.

Potency. Same thing once again. Potency alone doesn't tell you much, other than a 300 potency ability deals about 3x the damage of a 100 potency one. Why not have the game do an estimate of the damage with your current stats when you hover over an ability with your mouse.

TL;DR: Please give us more info about stats so that we can actually make sense of them without having to go through a ton of hoops and using tools the game doesn't officially support.