As many reviewers have already said, there is too many books to review each one, but after listening or reading 16 books I thought it was time.
This series is awesome, well-written & engaging.
First off there are so many well-developed characters, they grow into their roles and into their own story lines so well.
Second, each book has a monster of the week issue, sometimes two, BUT older plots and events are weaved in throughout the series, so you really feel like this universe exists.
Lastly, the books are fun, exciting and are more than just zap-zap science fiction. These are good well-rounded stories.
If you like Stargate & Star-Trek, series that have some battles, but are driven by characters, exploration and societal evolution than you will enjoy these. Especially if you enjoy SG-1 as a series, it in my opinion has a lot of similarities in a good way. Is there some farfetched notions, science that isn't fully explained sure, but if you are looking for very hard sci-fi than this is not it. Again, like the series I mentioned, they explain the science, but it doesn't go to deep, and it is not factual, it helps push the story along.
Enjoy!