The best Stargate SG-1 episode since the original Stargate feature film, bar none. Flawless in every way.
The reason is no mystery. The writers of an ongoing TV series cannot afford to give each episode all they've got. If they do, they're going to run out of material in short order, They know this. So they pace themselves. So they "milk it."
But Stargate Continuum was the capstone of the entire SG-1 series. The writers knew this in advance. They knew it was a case of "That's all, folks!" Therefore the writers knew they could afford to write to feature film standards, rather than mere TV episode standards. So they did.
The result speaks for itself.