Other reviewers mention that Stargate Atlantis had become a bit of a cliché. It was the same as Stargate SG-1 with different characters. In some ways it had become a comedy.
Now, we see the dark side of the Stargate Universe in a very serious drama. It is vast, filled with new, unknown creatures, and emphasizes the basic struggle for human survival in a radical environment. It may even be closer to the original movie than the first two series.
The characters are better developed than in the previous two shows. They have ghosts that haunt them. They have vices they try to hide. They have different opinions on the way to handle things and without a strong military structure like in the past two series, they find conflict with each other as often as the others did with aliens.
Understand that it is different! If you were a fan of the other Stargate worlds, then it is a significant departure. SGU is a drama, and has no intention of using sarcastic humor to make it interesting. It uses the story line and the conflict to make it interesting. You don't have larger-than-life enemies singularly capable of destroying worlds anywhere.
There are glaring differences between this show and Battlestar Galactica, to which this SGU has been compared. In BG, there was one primary enemy (mixed with a good bit of internal political strife). In BG, their home was destroyed; in SGU their goal is to get home. There is no 'supernatural' element that we saw in BG. Many other facets would reveal spoilers, so watch this show without the expectations that it will be similar to either BG or SG-1 and SG Atlantis.
Can someone watch SGU without knowing the back story of the Stargate Series? Possibly. You might do well watching the movie that started it all. This show uses some technology found in the other series, but not much. Often, they are discussing the other events well enough to put together whatever history they may be referencing. Give it a shot. If it doesn't make sense, then watch a few shows from SG-1. Atlantis relies heavily on SG-1, so don't bother with it initially.
I hope you enjoy the series as much as I!
