My problem with SGU was how dark it was, to the point of monotony. Every episode was either someone being murdered or someone being betrayed or someone being marooned (and inexplicably showing up later) or the ship being in mortal danger. And basically no one on the ship was likeable but the main kid whose whole character was designed to be likeable.
It was basically like The Walking Dead, but in space. It just didn't feel like a Stargate show.