We struggled to get Traveller to work in that era as well. Everyone could see it should be brilliant, and I would devour Andy Slack's White Dwarf column each month, but we couldn't quite get play to spark into life.
I think the problem for us was that sci-fi was defined by a range of brands - Star Wars, Star Trek, Battlestar Galactica, the Stainless Steel Rat, Neuromancer, Blake 7, Doctor Who - and Traveller didn't give you those. Or Rogue Trooper, Strontium Dog, or ABC Warriors from 2000AD. It wasn't built from recognisable sci-fi. It was more like the computer game Elite - it did it's own thing, and you had to appreciate that thing for itself.