Yes, i am bringing this up again, yes i know the community hates when you have suggestions, yes i know i will get flamed.
Mana regeneration (and flat mana) being on a prefix is not good. I understand that the devs want to curb mana and how its spent and want you to make choices. But we are talking about a stat that even with perfect tier 7 rolls on your rings, amulet, belt and relic you are only gaining 275% increased mana regeneration. That is moving the base mana regeneration of 8 to a measly 22. The amount of things you are losing missing out on 5 of your prefix slots is immense.
With my current build of using the talents given to me in the rogue and marksmen tree ( increasing mana cost and damage of skill )Im going to have to be using a mana building skill regardless of how much mana regen i can stack and in the best case scenerio save me the time it would take to cast 1 mana gaining skill before using my main skill again. Having 275% mana regen ( perfect tier 7 rolls not even realistic) is not going to change me having to build my own mana back with a secondary skill.
If you absolutely must keep mana regeneration ( and mana ) on a prefix you need to increase the amount given. But i still think it would be nearly just as hard of a choice of picking between max life / resists or mana if it were on a suffix.