Honestly I am finding the combat too easy (far easier thans DOS2). Im in about 8 hours of gameplay.
How are you mixing your party? I have 2 fighters, 1 wizard and 1 cleric. If you select your actions well it is actually very easy.
Taking 1 enemy at a time, toggling between weapons (range if enemy is far away and switch to melee when you are close enough), magic missiles should do the job. Cleric heal and second wind for tougher battles. Buy heal potions.