In the campaign I used tactical combat because that is just cool MoM style combat and is really fun to me, however when I came across the demons that burn every one of my units for 10hp in damage and I had no way to stop it or deflect it in anyway, and healing was incredibly expensive, I tried auto-resolving combat. To my surprise and dismay, it made all the difference, now I'd lose maybe 6hp to ONE guy and I wouldn't lose any units at all, so I ended up exploiting this massive imbalance for the rest of the campaign since tactical combat helped me in absolutely no way, it simply punished me for trying to be tactical.
Please fix this, otherwise tactical combat might as well not exist. Back in MoM, I believe you generally suffered losses in auto-resolved combat, but in tactical combat, if you were resourceful you could generally do much better.