Why I think SGU failed.
In Atlantis they were all “Oh ok cool we’re stuck, lets have some fun and learn some shit.”
In SGU they were all “OMG WE’ER STUCK AND WE HATE EVERYONE AND WE ARE GONNA DIE AND RUSH IS MEEEEEEEEEEEAN”
I think the difference is that with Atlantis, they knew they were going to be stuck before they went, the entire expedition was chosen with people in mind and they had supplies and things in hand before they went. They also had 38 minutes to get their stuff through the gate.
SG:U, on the other hand, had a different dynamic. They ended up somewhere (on accident) where they had no access to supplies, the people were not all qualified and they had no idea where they were going before they went. What they took with them, they had six minutes to take.
The power struggles on Destiny came because of the differences of opinions and no clear chain of command, whereas on Atlantis, those were clearly defined before the mission set off.
Also, Atlantis had places to go and people to see that were different, as well as a larger “home base”, as it were.
I liked SG:U. I’m sad it went off the air, but I liked the ending they gave us.
PS: Rush WAS mean. ;) Robert Carlyle, however… love.