While playing the Alpha several times on thing comes out clearly: the pure Warrior(Path) is currently extremely underpowered and (if you choose a warrior as party member) a real problem. You can't get them in the "line of fire" because he would block your ranger/mage spells, you can't put him at the frontline because he would die in one turn.
As a Lvl 1 Mage you able to kill a lvl 6 Mob (or at least the ones in the alpha), the warrior don't survive the first round. As consequence my last alpha-tries was mostly Mage/Mage, Mage/Ranger or Ranger/Ranger builds.
But i don't think this is a great problem, because of the open skill system. If i get this right, a Warrior/Mage should be no problem

I like the current combat system. The (A)D&D system (especialy the resting) adds a complexity to the fight, without adding fun or make things more tactical.
The main problem with the mage is (imho), that it skills boots the spells/damage directly. While building up a "fire"-mage at lvl 3, i was able to reach lvl 13 with my fire-speels. This leads to max damage at nearly no (mana)cost.
Adding the same "resistance" and damage-booster to Warrior and limiting the "spoken speels per fight" via a resource like mana should lead to a more balanced situation