Mana's problematic for everyone right now. They're reworking mana pools and regen pretty thoroughly and haven't adjusted the mana regen mechanics yet, as far as I know. Plus, they'll be balanced for level 90, not for level 85 (less of a big deal since things like Rolling Thunder and Primal Wisdom won't change much due to static mana pools).
This is the kind of thing they need feedback on, though.