Infraction: 6. Do not post unless you have something new and worthwhile to say.
Message to User:
Woo I love misinformation.
If you carefully read blizzards post on how ArP works you will see that you can't run armor down into the negative or even down to zero (unless you are up against an extremely low armored target like a lvl 10 mob). Very simply put: say your char sheet says you have 100% armor penetration... that 100% may only apply to say 82% of a mobs armor (the higher a mobs armor the less you can ignore percentage wise). This was done so that ArP can not become too powerful. Being able to hit a druid in bear form at 0% damage reduction would be OP. Sacrificing your other stats won't let ArP be put to good use. For instance if you throw away alot of crit for ArP you will not have the rage to fill all your global cooldowns and deep wounds will not be up 100% even with overpowers. I've been checking out alot of players armories and wondering if these players with crit in the low 20's% (usually not much AP or expertise capped either) buts lots of ArP (gems) can make it through entire fights without ever being rage starved consistantly.
To answer a question a little farther up, imo gem/gear for as much crit as you need to keep a good rage pool. After that it becomes more of a preference whether you want to go for more or not.