ShootMania Storm is one of the purest forms of competition out there. It's fast-paced, it's simple, and it's intense. It's reminiscent of older first-person shooter games, but does a good job of bringing that old-school feel into the year 2013.
Open beta has begun today for the competitive FPS, and if you're a fan of the genre, you should definitely give it a look. It's only about 1.5 GB too, helpful to those of us who have more games on our hard drives than we know what to do with. There are three modes, a battle royale, team capture points, and 1v1 "Joust" mode. Joust mode is easily the most intense, as it is simply your skill against theirs.
Download the open beta here.