I think Greg Egan writes very optimistic science fiction that only really does 2 sort of. Exceeding the speed of light is, from my point of view, so absurd a premise as to make me feel that any hard science fiction which tries to get around it is not serious.

Its not that I can't enjoy that kind of science fiction, its just I can't take it seriously as having anything to do with actually reckoning with our position in the universe as human beings. Universe Big.