As in mediocre scifi tv shows, there's plenty of catalog and current stuff. My issue is frequently that the first season or two were excellent, while subsequent seasons were garbage. In terms of movies, there's tons of garbage such as the scifi movies produced by bottom feeder "mockbuster" studio The Asylum. (The Asylum were famous for producing the Sharknado franchise and other absurdities). In terms of decent quality scfi movies, there's hardly anything worth mentioning that isn't already a classic.