Battlestar Galactica is the exception here, not the rule (and even it had more humor than its reputation for bleakness). I don't think the charge that sf in the 1990s and 2000 has much merit.
I do. And I find the idea that New Galactica had anything even approaching humor in it to be (ironically) laughable. There was NO humor in that show whatsoever, which was only one of the things wrong with it.