I may be wrong but IMO you'd better impress someone unfamiliar with FS game series with single player campaigns/mods. There are 3 main reasons why the FS multiplayer isn't good to start playing FS: 1) FSO multiplayer is somewhat laggish, 2) it is much easier to learn controls and tactics in SP, 3) most MP missions suppose the player to already be familiar with FS plot/setting. Thus the best way to get someone else into FS game series is to guide that person through the installation process of some of the best singleplayer mods (particularly the FSPort is good for start) or to show him/her some good FS-related trailers or mission playthroughs (there is a bunch of them on Youtube).