The level is decked out in a texture style that almost seems an evolution of the textures. However, the little graphical touches in the level are gorgeous - Two trees hang over part of the level dropping leaves, which spin and rotate as they fall. Pipes run along the ceilings in corridors before disappearing up the walls of the buildings. Everywhere you go you see small details that just catch your eye, making the whole map a lot more "believable".
Gameplay is both fast and good fun. There is simply no-where to hide and hardly anywhere to camp.
The weapon choice is limited nicely to a select few (with the notable exclusion of the Railgun), and power ups are non-existent - Definitely a bonus as the balance is perfect as is.
Player load is best at around 4 or 5 - Anymore can make the map seem small and compacted at times. However, even with more the games are still fast and the games are always close and well fought.