I always try to keep my crit at a decent level. Crit isn't that important to a warrior, but something I keep an eye on.

I would recommend in this order:

1. Focus on armor and health
2. Focus on damage/dps
3. Focus on mana
4. Focus on crit %.

I don't worry about mana ATM because I use mishi. Pets, passives, awakens, gear (potency, assault, warfare types) and other things play into your choices as well.