I'm playing on Normal and all I do in combat is dodging and spamming Heavy attack. The AI seems to go bonkers if you move around a lot, giving Geralt a couple of free hits.
Trying to do anything other than attacking one opponent at a time seems a ticket to a quick death, with the clunky controls and **** camera. Closed spaces are a problem, but that's what signs are for.
Enemies don't really attack intelligently either, they just lumber around, flailing their weapons like morons. Frankly, the combat is one big disappointment for me, along with the butchered alchemy system.