Are there any games out there (completed) that are similar to what Star Citizen promises to be? Besides Elite: Dangerous.
In terms of playability by modern standards there's Ooolite, the X series and Freelancer. FreeSpace 1+2 in case you want mission based pure combat without the open world and trading. That's about all the interesting ones you should look at if you never played anything old.
X series died with Rebirth (do not play that) as they went towards a console gaming approach where X3 was still a solid attempt at universe simulation. X3 AP is the later one and has a few more features but the X3:TC plot is more easy to get into - it's not like anyone plays those games for story though, it's all about trading, upgrading ships and station building.
This lack of competition is ultimately why SC made over 70m US$ off promises alone. You can sell people a mystery box if only there is demand.
Yeah I understand how they made that much. As soon as I saw the SC trailers I went and bought an Aurora (do not buy the MR, I made that mistake). Yeah, so I think I will be getting X3. You get both TC and AP on steam for $20