I want openness done right, or not done at all. It's clear D:OS makers had a clear path in mind for you to take through the first two areas and you'd be punished with a lopsided difficulty curve if you wandered around, like I did.
I love open environments and freedom of exploration, so in D:OS I ran around the Cyseal area running into things far above my level - dying, reloading, finding the right approach etc. was hard, but rewarding. I don't mind the 'find 100 ways to screw with the dumb AI' game when it's fresh and the odds are against you. However, soon I realized I missed Black Cove and went to explore there at level 10 - bam, everything there is level 7 and it's 3-4 hours of my life wasted on trash combat. Same with the winter zone that I didn't find until I was almost done with Silverglen; the Frost King died in one round. Another 6+ hours of trash combat. Why didn't they at least bother to put one optional, harder enemy in the easy areas to spice things up (e.g. BG2 had Liches hidden around)? I hate to say it, but RTwP handles trash combat much better.