Like you, I'm wiping a lot, but I have learned a few things along the way.
Use Scout mode - this will allow you to get to monsters/enemies quickly and get a few hits off before they notice you.
Formations matter - put your weaker characters in the middle of others, your mage can do a lot of damage if they are alive.
Use Spells, - they are there to help, don't just charge in and auto attack, use your spells.
Rest and heal a lot, use the common rooms in Inns, your Keep etc.
Get a well balanced Party, I too started a Ranger, grabbed the mage at the first town, then pre-made the rest of my group, a fighter, a rogue, a bard and a Cleric.
Target enemies 1 at a time, and make your whole party go after them, target casters and archers first, then everyone else.
I hope the above helps.
