I've only done dual lone wolf so far.
It's definitely doable. So far, without abusing sneak at least, str stacked warrior + int stacked mage w/glass cannon on both has been the easiest. It's also got some fun/amusing synergy. Mage can make up for warrior's mobility by hasting, snaring enemies, teleporting them towards the warrior, or in some cases actually dropping the warrior into groups of enemies.
Dual mage is also fun, but mages have annoyingly weak damage that makes fights drag on long after you've essentially already won them.
Archer/Scoundrel right now seems too broken now to be enjoyable since sneak is such a big part of the play style but the AI just doesn't do anything about stealthed enemies.
