Just plain awful.
The visuals are at best dated at worst just pure lazy art design by obsidian.
The AI is also broken as sneaking up behind someone is more trouble than walking up to them from the front or side. If you disable the alarms while in combat they just go back to patroling whether you're attacking them or not. For close quarters combat enemies will pull out guns and shoot the crap out of you while you try to button mash a hand to hand takedown, but whats worse is sometimes they will run from good cover right up to while you shoot them.
The shooting is also problematic as it presents itself as a shooter, but its more like an rpg where you slowly take down a health bar. So shooting in the head does as much damage as shooting in the big toe.
I could go on and on but I cant be bothered anymore so Ill end by saying that sega need to get out the software market as anything they put their name to of late has been terrible, and the worst thing about that is that they have been really good IPs that could have been great such as this or AvP.