A note that rogues and mages have equal hp, if built/geared decently - the difference being the low armor on mages.
Warriors don't have to be low on mana. We recommend adding all 3 stat passives to the main full str build, evening things out. Mana costs on warrior are also lower, making them more than even with other classes. Mana pot use on rogue is over 4 times more than on warrior, so "low" i believe is inaccurate. You can not judge mana by the number alone.