Pivotal - Well, at least in the sense of transitional! That was a nice ending to the three-parter, and Dr. Weir left (for now) as a hero. So Carter will soon take over Atlantis, and I wish that Dr. Bill Lee would stay, too! I like his personality, and with Carter, Lee, McKay and Zelenka we could have four ultra-techies butting heads. I wonder what reason they will give for Carter to assume command there instead of a more experienced full bird colonel like Colonel Caldwell, who's also spent more time there. Maybe she'll be there for her experience dealing with the replicators.
Replicators vs. Wraith - I think the replicators would crush them. Even though these replicators are less formidable than the Milky Way ones (they need to utilize actual material to build ships and stuff), the wraith may not even have any technology to fight them with.