I used to write abroad for travel guides, and I've traveled to developed and developing countries in Asia, Europe, South and Central America. From a low to moderate budget perspective, this book is a letdown. Not only were the budget restaurants and accommodations expensive, nothing we found was even a good value at its price. If you can't afford super expensive to get super nice ($40+ meals, $200+ hotels), this book leaves you with sub-mediocre options. My experience with their "Budget Value" listing ($60/night!) was 3-inch cockroaches in the bathroom, no warm water and loud neighboring bars.
Public transportation is skimmed over, with bus and boat terminals missing from maps and costs missing from text. They repeatedly recommend renting a car or flying to nearby cities, which is fine albeit very expensive, but left me no information to make public transportation an option. International bus travel was incomprehensible.
Some recommended activities were downright boring. Frommer's is simply too positive on every meal, site and hotel, and in the end, that doesn't help plan a trip! Negativity may not be nice, but it's essential in a travel guide - if the meal or hotel or Mayan ruin or river is so-so or awful, don't waste my time and money. If I had only known, I would never have traveled with a book that reads as if written by someone who'd never bothered to take public transport or stay in budget accommodations. This is my first and last experience with Frommer's.