This was a great little 'bottle' show that really built some of the characters, and even introduced some new ones. It did throw up some questions and ideas from me though.
I liked seeing Dr. Cavanagh and Dr. Zelinkha but I hope we continue to see them and they don't make the mistake of 'Star Trek: Voyager'. In much the same way, Atlantis itself is a huge 'locked room'. There are a limited number of people from Earth that can appear or die (and an unspecified number of Athosians), and a limited number of 'puddle jumpers' that may or may not be repaired. They've already killed off Col. Sumner and blown the back off one jumper.
Secondly, 'Stargate SG-1' just made a big point in 'Lockdown' about the Russians not being involved in the program even though they were promised. Yet on 'Atlantis' we see all nationalities. McKay is Canadian, Zelinkha is Czech. So why was the 'Atlantis' expedition the only multinational one?
I noticed that this is the second (or third) orbital stargate they've discovered in Pegasus, but back in the Milky Way I only remember one. I wonder why that is (apart from the real reason of the SGC not having a puddle jumper that is)
I've wondered why the Ancients built the City of Atlantis on a Waterworld. They are advanced humans, yes? Not fish-people anyway! But the bug creature was said to be a primitive-Wraith-evolutionary-relation and it had a very strong reaction to the salt water solution. So I was thinking that maybe there was a military advantage to building Atlantis in the middle of a salt water ocean.
This series is very different to 'Stargate SG-1'. Again their was much more humour in this episode including the old 'Cling-on' joke and McKay's antics, and I'm not sure there would ever be so much medical and wormhole related techno-babble in an original series episode.