Surprisingly Good!
Yes this is an adventure game but you control the movement of your character using the keyboard which gives you a sense of freedom. You can speed walk by holding down shift or slow wak by just hitting the W key without shift. The areas of exploration are more expansive than a normal adventure game so you don't feel boxed in.
The graphics are good and voice acting is very well done.
The only problem I had was reading documents. I felt like there should have been a magnifying glass provided to see the fine print. I was sticking my face so close to the computer but still had to squint. And in order to figure out puzzles you must read the documentation. That was my only complaint.
Be warned that some items you come across cannot be picked up or used unless certain tasks/dialogues are completed. So if you can't pick up an item or advance make sure you've talked to everyone and checked documentation.
So if you like mysteries and adventures this is definitley a game you must play.