New comers may enjoy it. With hours of fun stuffed into roughly 2 gigabytes of CD space, Diablo II is a champion among the Action-RPG genre of games. This game has several modes of play, depending on the map. Default choices are bombing missions, where the terrorists have a site to bomb and the CTs have to prevent them from getting to the site, or if they do, disarming the bomb. There are also hostage rescue, protect the VIP, and escape.
Clans are teams that simply love to play the game and challenge other teams.
If you have Half-Life, CS is well worth the down load. If not, then you have options. Do yourself a favor, go buy this game. You won't regret it.