In Stargate: Universe, literally every day on a ship exiled billions of light years from Earth was a struggle for survival and entire episodes were devoted to those struggles. Most of the machinery on the ship didn't work and people took out their frustrations on crewmates. There was a lack of consensus as to who was in charge--the ranking military officer, the lead civilian scientist, the politician--and lack of consensus over whether to find a nice habitable planet to settle on in that particular corner of the universe or to keep trying to get back home. Would Voyager have been too depressing if it had followed that format or would it have been more believable? It's hard to say considering Voyager lasted seven seasons while SGU got cancelled after just two.