You are correct the Stargate universe is very well thought out. At least until season 9 anyways...
A couple of things that kinda bothered me. A constant line of dialog is that the Gate Wormholes are only one way. Ep 1 if you look closely, Apophis left through an incoming wormhole.
Also the initial description of how the gate addresses worked in the movie was very flawed. 6 reference points are not needed to locate any object in space, only 3 are. r theta and phi. It would be very difficult for any race to obtain space flight with out something similar to Spherical Coordinate System.
I put the Stargate Universe as one of the top fleshed out universes in Sci-Fi. With all the Star Trek references through out the program, it would not be too far fetched to believe that they saw the chaos in the Star Trek Universe (conflicting canon sources) and said, "we can do better than that"