Thus far I've been playing a thief/mage hybrid class in KoA, but I rarely find it advantageous to sneak or go for sneak attacks. Moving while sneaking is extremely slow, and most of the time I find I can resolve battles quickly by just jumping right in with my daggers and chakrams. Enemies also seem to notice me quickly.
This all combines together, so that when facing off against a group of enemies, I might sneak for 30 seconds and perhaps, if I'm lucky, I'll surprise one and do a bit of extra damage compared to my normal attack. Then the rest tend to immediately notice me, and I must dispatch them in "normal" combat.
I believe through a combination of Skill and Ability points, I could eliminate many of the drawbacks and disadvantages to sneaking and sneak attacking, but this has a significant opportunity cost. Is there really much of a benefit to these skills and abilities? Does it ever make more sense to sneak than to just rush in, weapons blazing?