Natural Selection began as a simple mod but managed to build a great community full of gamers. What was once just a mod for 10 years has become an immersive shooter full of action and RTS elements with modern mechanics that promise to attract modern players. Natural Selection 2 has no amazing story, is jumping straight into action that makes Natural Selection 2 Special. If they decide to take the role of Frontiersmen or Kharra will have a totally different experience. They are both full of action and strategy but offer a completely different experience, so it is recommended to experience both.
After about eight hours of game Natural Selection 2, I'd say the Unknown Worlds has managed to create something unique and one of the best shooters of the time. In my personal experience, the community was generally good. There is usually a good communication in the team, even the most novice players. Having some experience in the first Natural Selection is not required but is undoubtedly an asset, although other players helped moving right away. One of the best aspects of Natural Selection 2 is your community. Like most online games there are a number of bad apples, but at least there is a tremendous amount of good players to compensate