I was really impressed with this episode. First, I really liked the change of casting to Weir - the new actress looks much more true and somehow more fit into the position and she really managed to get very great impression - the talks with System Lords were quite enjoyable. There has been some that kind of political episodes before but this was over them all - mainly because now Earth had something to play with but in the end it looked they did not brought it.
On the other part of the episode, Sam and Teal'c are going to Asgard Galaxy to get them help O'Neill and find themselves in dangerous position between replicators. The fifth is back and he really is angry, having all those negatives emotions. And the way he seems to enjoy the tortument and suffering. And the end - great cliffhanger.