Enemies and Threshold are excellent episodes, Threshold especially for the in-depth look into Teal'c's past. The other two, meh. Honestly, I never cared for John de Lancie's character, which is odd since I like him in everything else I see him in, like Star Trek and Torchwood. I guess the main problem is that they just made it too obvious that he has a hidden agenda, that he's not a good guy at all. The guy is basically a moustache twirler more obvious than the over the top Goa'uld.