At least I'd say this, that I know of no reason why a work of hard science fiction could not also be a work of real literary merit. It could excel both in terms of the scientific content and in terms of the attributes of genuine literature.
That the thing could be done doesn't mean it has been or ever will be done.
I hope no one will leap to take offense at what I'm about to say but will read me with good will.... I think there may be, inherent not in hard science itself, but in the attitudes that might be common among its practitioners, something that tends against the probability of high literary merit.
1.Hard science means deep mathematics. Now mathematics by its very nature is as bloodless a thing as the human mind can engage itself with. Agreed? -- is that fair?
2.There is nothing inherently wrong with hard science and mathematics. As we are always reminded (perhaps often by people without much proficiency in mathematics), this approach to knowledge yields all sorts of applications that no one wants to do without such as anesthetics and antibiotics. But the methodology or hard science can be appropriated for the purposes of an ideology. The ideology is reductive.
3.An ideology of reduction works against literary achievement; conversely, literary achievement may take into account what we know through the application of the method, but will include more. The trajectory of literary achievement is towards expression of the depth and height of the human dimension.
So, for example, when I read the great Russians, whether the physician Chekhov or Tolstoy or Dostoevsky, I find an evocation of the human that is worthwhile and that (so far as I know) could be made no other way than by literature; take such writers away and I will not find that I can do without them because all that I miss from them is still there in the sciences.
So if there are things in literature that cannot be evoked by anything else that people make (including scientific articles), then a great work of hard science fiction will need to be good or great as literature as well as good or great in its scientific content.
Is what I'm saying correct? It makes sense to me, but do others agree?