The Game Career Guide site has up a story that tries to lay down some rules for a good First Person Shooter. The article advocates in favour of player choices, fast action, and rich environments; keep the boring cutscenes and make sure the players are getting a great bang for their buck. From the article: "Don't allow the player to play the game half-heartedly, which is a dangerous stumbling block at any point of the game. Example: Half-Life 2. While the introduction presenting the environment of City 17 was much more effective than the tram sequence of Black Mesa from the game's predecessor, the sheer length of time between point insertion and getting the crowbar would never have worked in any other game."