Well it's not that realistic. I think no matter how good you are you're not going to fare very well against a troll or the crazy Poles' interpretation of the kraken.
It's just a much harder and more tactical game than the last one. And it can be whatever you make of it, a potion master tactician, kickarse with the signs or just go for a good old hack and slash, run in and boot the shite out of everything that moves.
I think it's gotten easier after about level 6-7 though, with better armour, weapons and more health it's a bit easier not to get wiped out in seconds by 3 or 4 of the weakest monsters in the game. Now I'm confidently wrecking squads of harpies, endrega's, people...