Prima is a hulking monstrosity. I have two examples to show off: the guide to The Orange Box, which I own, and the guide to Star Wars BattleFront 2, which I have read and therefore didn't buy. Both are ridiculous.
In The Orange Box guide, the maps are impossible to understand, even for someone who's played it all before. They have just no-clipped, then taken a screen shot from above. This makes it incredibly confusing. The key (for the Half-Life games) is always as follows:
1. Entry point 2.Clear Point (Or 'Exit') 3.Other Items
That is all the information provided. Very helpful. The guide through the Half-Life section is essentially a list of spoilers covered with tiny screenshots which are too small to be of any use, and yet still clog up the page. This problem grows worse in the section about TF2, where each page is speckled with bold titled hints labelled 'Hint', or 'Caution'. In many cases, this title is larger than the hint itself. Hints such as "The sniper can empty a full SMG clip in just 2.5 seconds". Wow! Even worse: "The TF2 dev team commonly refers to the soldier's critical rockets as 'Crockets'". Fascinating. The only helpful part in the entire guide is that for Portal, becuase it's impossible to screw up a guide for a puzzle game.
Now for the guide to Star Wars BattleFront 2. I opened this up in the game store, and flicked through. Looking at the section for the Death Star level, I could see the author didn't have a clue what he was writing about. If you haven't played this game before, bear with me while I rant. Now this guy said you could remove some of the bridges in the level by damaging them. Fine. He said to do this, you had to throw a thermal detonator onto the middle of the bridge. Wrong. You have to destroy the control panels on either side to make it drop, which might get caught in the blast if you're lucky. He then said you couldn't repair the bridge. Also wrong. An engineer can repair the control panles, replacing the bridge.
I don't know how they were able to mess up this badly.