The Size of the Galaxy constantly Underestimated in Stargate
It seems like in SG1, SGA, and SGU, heck even the original movie, the size of the galaxy, whether it be the Milky Way, the Ori Galaxy, The Asgard Home Galaxy, Pegasus, etc, is horribly underestimated.
A galaxy is not just a small collection of stars and a few planets here and there. There are hundreds of billions of stars in even the smallest galaxies.
There are maybe what, a hundred worlds visited total in the entire Stargate series, and yet they make it out as if "Oh the Gou'uld has control of the galaxy" "The Replicators have control of the Galaxy", "The Ori has control of their galaxy", "the Wraith have control over Pegasus", etc. it takes me right out of the series everytime someone on the show says that.
It's like show writers have no idea how large a galaxy actually is. It's mind blowingly large. You can't control an entire galaxy with a couple hundred Gou'uld Pyramid ships. You can't control a galaxy with a thousand Replicator ships. You can't control a galaxy with a ten Asgard ships.
Star Trek does it much better in which a few hundred light years can mean the edge of known civilization. Voyager was placed 75,000 light years from Federation space, and it took them 7 years to get home, 25 if you count the original timeline. All of that happened in a single galaxy. They did not underestimate the size of the Milky Way.
The Mass Effect video game series comes close to being like Stargate where a handful of worlds being under the control of an alien race means they control a massive portion of a galaxy, it's like they have no idea how large a galaxy actually is.
Maybe it's all about which worlds are habitable, and sure there could be maybe a dozen earth like planets in an entire galaxy for all we know, that still has nothing to do with 10 Wraith ships being a HUGE threat in Pegasus Galaxy. Ten Wraith ships means nothing compared to the size of the Pegasus Galaxy, which although smaller than the Milky Way--is absolutely massive with hundreds of billions of stars and planets.