Note: Please disregard the play time. I'm running the game without Steam, so it does not reflect my actual play time.
First of all, I would like to correct a common misunderstanding. You do not require 6 people to play. Each ship has 6 roles that can be filled with "up to 6 people". Having one person take care of one thing makes it really comfortable and this is the way, this game is meant to be played. But it is perfectly possible for 3 people to have the responsibility of 2 stations, and fly the ship with its full potential (in a single instance of game client). I have 4 friends that got comfortable with the game, and now we're running comparatively easier set games with 2 separate ships (3 and 2 people per ship). Sometimes I like playing the game solo, even though it's hard to do so and possible only under lower difficulty settings. I'd say having 5-6 people per ship is ideal, but with 3+ people the game is absolutely playable.
Second false information all over the place. You do not need a separate pc with its own copy of the game to be the server. Go in the Steam/Steamapps/Common/Artemis and run artemis.exe. First window should be set to server mode. Now run it again, and make the second window the client. I personally connect my huge TV to my laptop and become the server, use the TV for the server screen (which is also the outside view of the ship), and use my laptop screen for the client screen (which is the screen of whatever role I'm filling). Entering 'localhost' will connect to the server running on the same machine.
I realize that this is more like a troubleshoot, instead of being a review. But in the process of deciding to buy the game, I immediately recognized how awesome this game is. The questions I had was the ones I just described. You don't need this review to know that this game is awesome, it's already all over the place. What you need to know is that the most frightening part of the game (6 people minimum thing), is actually incorrect. Also; it is possible for up to 8 ships to play Co-Op or PvP modes. Talk about awesome.