I don't think potency is what we need. I think we need actual skills. Take a good look at your level 80 hotbar and compare it to your old level 70 hotbar. Yes, we lost alot of our bloated skills we never used, but lets be honest... what we have now is extremely baren when compared to all other jobs. One example is deliverance stance. Yes, every tank lost their damage increases from those stances, but WAR also lost the passive crit buff which is now completely gone. That might not seem like much, you need to add it to what we have lost.
We have a gap closer we almost never use outside of IR window while all other tanks use them on cooldown for extra damage.
Finally... we are the only tank without a DoT (Salted Earth is a DoT). So lets actually look at our job guage. Its used for upheavel, and fell cleave/decimate. That is our class until inner release. It needed more tools to play with for our job guage like other classes, but we basically only got Nascent Flash with 2 passive traits/skills.