Okay so I just finished reading X-Files: Ruins and the book was really good up until the end.
The premise was very intriguing, a team of archelogists go missing down in the Yucatan Penninsula and Scully and Mulder are dispatched to find out what happened to them and bring them back alive if possible. The dialogue was spot on for Scully and Mulder through most of the book, but Dr. Rubicon left a lot to be desired. For someone who is an expert in archeology, he sure used the word "uhhh" an awful lot. I know most of us use this word as filler in our daily lives while we search our minds for the right words we want to say and it works in the movies but in a book it just looks stupid.
Towards the end of the book, like the last 30-40 pages Mulder and Scully start spouting stupid catch phrases from the 90's over and over again. Also I don't remember Mulder talking out loud to himself so much in the show, why couldn't he have just internal monologues instead of talking outloud when no one was there?
Finally when he is sitting at his desk when the case is all said and done he's fiddling with a statue of a feathered snake. Yet we never find out how he got this, he never buys it, never finds it, no one gives it to him, it's just magically there at the end of the book. So much for continuity.
All in all, the book wasn't bad, it kept me interested but the ending seemed too rushed to me. 3 Stars is the best I can give this.