Graphical wise I love the very industrial look, and the music brings that nice tech feel to the mix. Also in the start the core's shodan & GladOS mixup really made me smile. Though for example in the core encounter, the energy blocks often got stuck on top of the player character, which was slightly irritating at times. Otherwise I like it.
One massive gripe though is that I cannot just place boxes in a hole couple hundred thousand times :( 1/10