Ever since its release, this game has been quite the buggy bastard, but has been constantly updated. Sometimes it works, sometimes it doesn't. When you buy this game, there will be 3 clients to download: The normal Nexuiz client, the Beta client [to try out new features before they're released], and the STUPID Mode client -- which is basically an Offline/LAN client with the ability to play the game to its absolute maximum graphical fidelity: with very high shaders, high tessellation, and extremely high texture quality and ONLY recommended for those with almighty PC's built from the Gods. Downloading the normal client is good enough for most people, and is the one I use.
This game has a map editor too, and also uses the latest version of Cryengine 3, which makes great use of DX11 features. Nexuiz is a very fast-paced shooter of the likes of Quake III Arena, although a bit sluggish in movement and graphics performance, with average framerates between 60-90 FPS on my PC on high settings. Therefore, your PC needs to be able to keep up with high framerates for the best playing experience, but if your PC can't keep up with the dazzling graphics, this game also has UGLY Mode, which basically makes the game turn the graphics settings all the way down and make it go back in time to 10 years ago, but with pleasurable framerates above 200 FPS on a decent system.
When the game works, it's a very fun game with good ol' fashioned Deathmatch, Team Deathmatch, and Capture the Flag, with vast maps to choose from including community-made maps, and the weapons are certainly unique. The music is mostly pleasant to listen to, if not a little heavy on the futuristic Drum & Bass and Dubstep side of things. For the price, you get what you pay for, but it's certainly a game that is in dire need of more people since the servers are usually empty and not every bug has been resolved yet.
With the latest update, I heard that there is now a full demo, limiting you to play for only 30 minutes at a time.
If you need a new FPS game away from the likes of CoD, Battlefield, or other lackluster Multiplayer-Based Modern-Military Shooter titles, and have 10 bucks to waste, be sure to give this game a try. Just be ready for a major session of troubleshooting, trial and error.
Out of the 3 DiRT games, this is the one that has what the other 2 lack: Attitude. Sure, it has a lot of cheesy one-liners from your typical, well-known guys like Ken Block and Travis Pastrana, but I'd rather listen to cheesy one-liners than the bland and cut-and-dry monologues from DiRT 1 and 3. This is definitely more noticeable when doing Rally runs, where a female co-pilot tells you directions along the likes of "Easy Left", "Medium Right through narrow bridge", etc. In DiRT 2, the directions sound more natural and connected, whether you choose casual or complex directions. Whereas in DiRT 3, it goes back to the bland, lifeless, and very disconnected monologues provided in-game, as well as the "motivational" dialogues provided by your team as it did back in the original DiRT. The tracks were also fun, addictive, and fast-paced. Even the menu interface seems to be fun, casual, and laid back compared to the other 2 DiRT game's menus which were abstract and boring. Highly recommended!