I'm biting the bullet and trying to play this game now regardless. I did find a setting for my video card that should have increased the brightness, but I didn't see any result.
I've set my default screen resolution to 600 x 800, to get the game to start in full screen mode, that at least worked, but the darkness and graphical glitches are difficult to get rid off.
For fun I'll show some screens of my game, to show how it looks for me, to begin with the launch menu, as that now tries to annoy me as well:
At least that's not what I'm watching for a long time if I'm playing the game, I'm happy to assure you, but what I am looking at a lot is things like this:
Some stretches of maps can be okay, but others can also be worse than this. This doesn't have a lot to day with my initial complaint of too much darkness in this game, I concede, but you get an idea of why I'm not really happy about how this game is displaying for me.