I'm genuinely interested why reviews imply ~30+ hours of gameplay while S1kkZ nailed it all in half of that.
Not sure. Different play styles perhaps. I know there are a lot of "unmarked" missions in this Deus Ex only found through talking to specific NPCs or certain events, so perhaps that is involved. Generally I just look at an average of what people are getting, and I know for this kind of game I would take longer than most by a sizeable margin. Not that games have to be 30hrs+, but when I am really into a game, I certainly feel good about having a game last