I found the bad guys motivation to be confusing.
I was frequently unsure where in the giant structure we were.
Or why a virtual city was built 5 miles deep when something smaller and simpler would have done.
I'm not a geologist, but the results that the bad guys hoped to achieve seemed unlikely.

I liked the world building and it seemed pretty plausible, once you accepted that
some unexplained supernatural event had happened.
I like the characters and would read more stories set in the world.

Not reccomended. Clumsily written and the story is kind of predictable

I liked “Going Postal” more but this was another fun Discworld book

The training montage was a little boring. It seemed a lot like what we knew the Mercury astronauts went through. But this was written years before that happened. The purpose of the mission seemed kind of circular, but was an interesting variation on first trips into space.

Excellent sequel. New and interesting technology. I liked the culture on Mars and the relationships between Earth and Mars.

Interesting premise, exciting action, a little more gruesome than I like.

I love this guys books. Amazing story, fun and intense.
Well thought out and the sciency part all sounded plausible like I expected from the author of The Martian.
If you liked the others, go read this now.

I was expecting more Lovecraft, but got something more like modern times Holmes plus some ghosts.
The supernatural mysteries I was expecting turned out to be pretty natural.
It was also kind of tedious.

I'm much too old to be the target audience but it was an interesting read.
The comparisons to Lost are appropriate but shorter and with a more satisfying ending.
Scary, mysterious and surprising.

Big improvement over the first series mostly because the non-white characters didn't call Tom master. On the down side, there aren't any non-white characters. This book was published in the year I was born. The plot was ok and the super science was fun

Great space battle scenes but too much politics. Some interesting new information about the gates

Kind of a goofy time travel story. How did the lights stay on? But pleasant anyway. pretty dated but short

I liked the first book better. The flying saucer story was great but the kidnapping story was quite dull.

If you like Pratchett's stuff, you'll probably like this. It's a fun story about little people who live in the floors of a department store. They have to move and learn how to drive a truck.

A good story and also a good Man From U.N.C.L.E story.
One of the things I like about these books is that the authors are trying to make good TV shows. The characters in the books are the characters in the shows. They aren't trying to make the characters their own.

This is a book that is easily read a few pages at a time. There are stories about seeming thousands of places and people in Disneyland. A huge trove of history. It feels like an archeology dig as you learn all the many things that were in the same places over time.
Recommended.