You didn't miss anything.
Hey, Lost City was a great ep.
But yeah, after the end of that season the show went downhill in a hurry.

Jacob's death is one that didn't move you much because it didn't make any sense. They brought up why they couldn't just remove Selmac before he died and they said "Oh it'd kill Selmac." Well yeah, but, it's been established several times that Tok'ra would sacrifice themselves if necessary to save the human host, and he was gonna die anyway so...WTF couldn't they just remove Selmac?!
If they needed to kill off the character for contract reasons or something why not have him sacrifice himself in a grand gesture or something?