Dragonflight

About halfway through, the book about dragons introduces time travel. McCaffrey is clearly trying to blend sci-fi and fantasy, a noble effort, but in this case it just falls flat on it's face. It has some great pieces, but the time travel plot is so distracting that I can't enjoy the rest of the book.

Also, the plot relies on a bit of orbital physics (another attempt to mix the sci-fi into this book), but it gets it wrong. A planet with an extremely eccentric orbit would travel at about the same speed when close to a planet with a much more circular orbit, which would mean that a close pass of the two planets might last a couple orbits of the planet with a circular orbit, but not fifty. Maybe a personal niggle, but if you're going to base a major part of the plot around this, check to make sure it's right.