also frustrating: Feros had a few "one-way drops" that really shouldn't have been. I could have climbed them, and I'm a 40yo fat guy with a desk job and bad knees, not the first human spectre.
which became really frustrating when I was trying to leave via one of them because I just couldn't see the actual exit in Feros. In the end I had to use a walkthrough to figure out that there was a dark corner I had missed.