potions for either a quick defensive boost or a quick burst of damage seem fine to me,
however the mp and hp regen potions are laughably weak now considering there cool-down time, I understand they aren't suppose to replace a healer but surely to make them useful replenishing half your max hp or mp every 4.5-5 mins seems reasonable. I think these potions should be a set percentage increase not a max amount of points increase as currently.
atleast x-ether nq is just enough for blm to recast flare or give a low level whm enough to boost their low mana pool in long stretch fights.