I don't remember a game with a bigger replay value!
Graphics are just one word: amazing! You can choose between different video types.These days you even have a program with advanced graphics that is called Quake II Evolved.Its a free mod and you should grab it!
-Graphics 10/10-
The difficulty is nice on the singleplayer but can get annoying.It can also get annoying in the multiplayer if you are not skilled enough.
-Difficulty 8/10-
Controls are smooth and nice.Similar to Quake and most of the shooters back then and now.
-Controls 9/10-
Ambient sounds are perfect and the soundtrack is just amazing.
-Sounds 10/10-
The multiplayer can get annoying as i said. You will need a lot of time to adjust to the game cause it is pretty skilled,but that is just showing how Quake is awesome.
-Multiplayer 9/10-