Real ground not matching visual ground
I don’t know how to say it differently. The ground I see is not the ground I experience. My character and my constructs, like my rovers, go from driving over the ground, floating visually, to going into it. Not only does this mean unexpected hills( and trees), valleys and the such, but, more annoyingly, rough terrain. When you go down a smooth looking slope, only to have it not only drop sharply, but then to crash and get stuck...or roll and explode.
Reloading does not always work. Plus, I don’t think a game should force you to reload every 2 minutes. And even if it works for where my character is standing, most time the ground only a few in game metres is still funky.