Played a few hours of this, not a bad hybrid of FPS/Stealth/Melee.
In terms of storyline / NPC interaction there is much less than I remember from Butcher Bay.
I'd imagine the stealth sections are a bit too basic/contrived/on-rails for hardcore stealth-'em-upers but for casual players like me it is about right. You dodge around in the shadows, avoid spotlights, and then sneak up behind people with a bit of jumping/climbing thrown in. Then you've got a few shooty bits, I'm rather partial to the mech sections even though they are a bit too easy.
"Jack of all trades, master of none" is a phrase that springs to mind, but in this case much like a pack of cards, a Jack isn't too shabby. It's a sort of easy-going game that lets you do a bit of everything, you know, a bit like a starter platter in an American-style restaurant. Not the sort of thing that you would go out of your way for but once you start it fills a hole. If you haven't played BB then the closest recent game to it is probably Batman:AA
Graphically the style is very similar to BB / Doom3, looks decent although I do get flickering model textures on NPCs sometimes. Performance wise it is hard to fault, running at 90-150fps on my GTX280.
One word of warning though, it seems to limit the number of resolutions available in the menu to about 15. This meant that I could only choose up to 1280x768 or so. So if your graphics driver has a bunch of resolutions defined you may have to modify it and reinstall the driver (for Nvidia this means nvdisp.inf removing a bunch of resolutions you don't want like laptop / weird aspects etc)