Adria is all grown up now and back to continue her conquest of the Alpha quadrant (er, I mean the Milky Way). I liked this episode, and I was surprised by some of the negative reviews.
One of the reviewers asked: Where does Se'tak come from?
He came from Terminator 3! Seriously, didn't you immediately think that? I did!
Looking for plot holes in SG-1 doesn't really work. From the very beginning, SG-1 has required the viewer to suspend disbelief. Every single stargate that they have ever gone through has either led to an Egyptian (or Mayan) temple or a forest. None of the stargates have been defended by anything more than a handful of Jaffa!
This episode is a good one for a number of reasons. Firstly, it gets the Ori plot back on track. It had got fairly dark, and I think the producers rightly put in a couple of filler episodes to take the edge off it. Of course, it had to get serious again, and this episode starts with the murder of several thousand people.
The main thing I liked about this episode was that it reminded me of one of the best episodes of Star Trek: DS9. That episode asked the question: Would it be a good idea to free the Jem'Hadar from the Dominion? If you could do it, should you? Counterstrike explores the continuing development of the Jaffa Nation, now that they are free of the Goa'uld. Does power always corrupt? Does a power vacuum always have to be filled? Is there nothing but suspicion and war?
Counterstrike also explores further the relationship between Adria and her mother, as well as giving Vala and Daniel some more screen time together. There's no doubt that Vala is a member of SG-1 now and having Morena Baccarin join the cast isn't a bad thing either!