Tbf, if it weren't for the EA exp cap, it wouldn't be nearly as hard, because you'd be deep into level 5 by the time you enter the Underdark (which is a huge power spike for all characters).
I suspect playing the same encounters on release will feel like night and day.
Oh yeah wanted to mention this but I forgot. Unless it will be drastically changed, I can certainly see how we could find ourselves reaching the underdark at level 5 or even 6 in the full game
For the final release the whole act needs to be rebalanced, IMHO, because at L5 it would be much too easy. I would say something along the lines that all difficult encounters need to be upgraded on level and the XP needs to be downgraded to that players barely reach L5 during the Underark.
The Underdark should be difficult. In BG:2 you run into a group of three mindflayers, and a Drow war party where two clerics and on wizard hit you with L7 spells, right at the start of the Underdark. And it gets better from there.
