I have Arcane Warrior on my Mage, it's nearly useless and mostly for fun. It requires you taking points away from Magic/Willpower and dumping at least 2 or 3 levels into dex so you can actually hit things at a decent rate. The armor is off the charts though. But in this game since Armor isn't like in AD&D (higher armor only means less damage taken now, instead of no hit at all) it's pretty useless unless you also dump more points into Constitution.
My Armor and Defense is at 29 wearing Ancient Elven Armor chest and helm (haven't found the rest). The Defense is in the 80's. This is with Rock Armor and Arcane Shield I think i'ts called. Good tank if you build em right, just have to use spells to get attention (which...is easy
). But you won't have the instant aggro management of a proper warrior (taunt, threaten).
With a Spirit Healer it would feel pretty bad. You'd have ot choose between the two, and they both travel down very different paths IMO. I mean you could certainly do it, but why waste their talents on the front line by standing in the back trying to heal. And if you're in the heat of battle healing, you're gonna spend your little bit of mana you have left over from casting the stuff you need to actually stay alive.
The ability to do physical damage is directly proportionate to your AW ability that instatly gives you 50% fatigue. Which makes your spells cost 50% more. See where I'm going with this? But you do hit like a beast with 39 Magic (which is like STR, and I think the STR still tacks on top of that though I could be wrong).
A good match for min/max playstyle would be blood mage. Personally I'm just keeping AW, though I'd like to get shapeshifter and play with that...but I'm pretty certain spells don't carry over into other forms unfortunately.
My Mage/Tank bounces between the two roles. Heavy into primal, so I can stand in the middle of a bunch of guys, cast firestorm and continue to attack them while my spell shield and AW ability to go halfway into the fade reduce the damage i take to nearly nothing. Which is great because enemies seem to focus on my Mage since he's always in front when a cutscene ends....