As high-concept high-wire acts go, there aren't many genres as risky as space opera. Starting with that name, which almost nobody likes. I'm using it here, for lack of a better one, to refer to that particular strain of science fiction that involves large-scale, far-future action, staged with massive spaceships powered by space-smearing faster-than-light drives, in which good-looking humans traverse the void in order to meet alien species and exchange laser fire with them, pew pew pew.
I don't use the term pejoratively at all. When it succeeds, space opera is magnificent. The great ones--Star Wars, Star Trek, Firefly, the Mass...