I played it two years or so ago. I played it on Hard mode and I didn't find it difficult at all, aside from maybe a few encounters.
My party consisted of:
PC Kind Wayfarer Paladin for burst damage, offtanking, and off heals. Eder for tanking Durance for healing and buffing Aloth for AoE damage and crowd control Grieving Mother for damage and crowd control
And the last spot was a revolving door for whatever other party member I felt like bringing. Usually Sagani the ranger, because she came with her fox as an additional body to take hits for my other party members.
Seriously, crowd control is the great equalizer in that game. I got a ton of mileage out of Aloth's Chilling Fog (aoe cold damage and blinds enemies in the fog) and Slicken (aoe knockdown) spells and they are just level 1 spells.
My Paladin was surprisingly helpful, between his aura and restoring party member endurance every time he killed an enemy or used Flames of Devotion.