I think this game has just right difficulty level. You can make it so much easier if you start abusing potion of hill giants, speed potions and invisibility potions. Also stealth is broken. You can just kill everything with one character and stealth. Just go behind wall or rock and shoot arrows, go hide, shoot arrows etc. Enemies just eat those arrows and be like "What's that? Arrow to the head? Just another day, nothing to be worried about.".
You don't really have to use this. Just care about backstab and highground (the intended basics) and really, the game is easy with a party of 4.
I recently ended a playthrough with a solo druid. Except the 10 firsts hours, it's the only challenge I have ever had and it's doable without potion of hill giant or exploiting hide...
As soon as you know the basics you understand how bad the balance is. The difficulty of some encounters only exist because a few ennemies have WTF features and can OS your characters... nothing more. Strategy is close to 0 in this game.
The harder combats would be a joke if we could reach level 5.
How do you manage the Fights in the Underdark with a solo Druid?
