I think it's extremely difficult to compare a game that hasn't even been made yet to a game that is in alpha to a game that is constantly under development. You'd have to play all of them for at least a week to make a sensible comparison.
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But here goes:
SC: looks promising but that's all it is: promises. Feature creep risks this game never coming out, as customers' expectations rise exponentially with its budget. The first rule in publishing (and manufacturing): Just Ship It.
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NMS: looks terrific; the scope of the game appears mind blowing. But I worry that after 100 planets people will get bored. Roam, explore, shoot some things; I can already hear people complain, like they did with ED, that it's too lonely, too undirected, with no clear goals --even though that's the point. The planets for all its PG magic are already starting to look rather samey (I went through a number of different videos and I don't see as much variety in the landscapes and animals as I was expecting. More worrying, none of the reviewers explored this either).
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ED: graphically promising, aurally lush, it is a nice workable balance between arcade dogfighting and the realism of space flight. You really get a sense of scale. Needs a lot of tweaks and improvements, but basically the game is there, and that's more than can be said for the others. I think that it will take years to realise its potential but then again so did EVE Online. As computers get more powerful games get more complex, and it takes exponentially longer to build them.
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I think that some people will always complain. ED will get walking around ships and people will complain there's nothing to do. It will get planetary landings and people will complain there's nothing to see.