It does feel too dark for me. It's a shame too, living in Australia most of my play time is night time and I have no inverted day/night cycle servers (and overseas I lag horribly). The human eye can adjust to darkness, I've spent time out in the bush in Australia on dark nights and certainly been able to see more then I can currently in the game. I'm more used to it now (have chemlights, flares, wits about me etc) but it feels too dark most of the time.