There are no THAT much of a problem with performance. There are micro freezes for seconds-half seconds which happens once per minute-two. It looks like engine trying to load assets while nothing particularly happens. Or garbage collecting things. Or something else, not sure what exactly happens there.
Graphics is okay, time of pre Crysis graphics have passed long ago. Models looks okay, textures are okay, shaders are okay, lighting are okay.
Overall, I would name it a version 1.0. There are some small bugs, for example circle-strafing around some enemies shows up that they can shoot at player without being fully rotated to face player (same as doom imps), but nothing game breaking. Some patching would be nice, but you can enjoy and have some fun from it even now.