The Jack, Sam, Teal'c, Jackson combo is one of those magical combinations that made (the majority) of SG-1 great, even when Jonas replaced Jackson for a season, it was still "really good". When Jack got replaced, things really went to hell. I forgot the exact season.
Atlantis is a good show, but it's totally different from SG-1. The atmosphere is different, the feeling is different. In SG-1 the humans were a weak race, just beginning to step out into space. Earth stole a few small ships in the beginning, toward the end of the good seasons we had the Prometheus, but it was mostly relegated to defending Earth. Every kill the Prometheus got felt like an accomplishment, even if it was just an Alcesh. Every System Lord brought down by SG-1 was an amazing work. The ancients were gods who understood things that would kill a human mind.
In Atlantis, even when Wraith queens are killed, it just lacks any sense of awe... it's like a FPS. You just pump another round in the shotgun and start looking around for another one. The Deadalus can kill virtually anything from any race, from the Wraith to the Ancient replicators, from cruisers to battleships.