So far, this guide has been everything it's supposed to be. EXCEPT:
Mission 6: City Museum. They neglected to mention the MAP. If you don't find The Map on the pillar/column, you'll only get the Silver Level badge. You need this map to get the Gold Shield for this level. Worse yet, it's a tough level, and having to repeat can be THE SUCK.
The Map is on a Pillar/Column to the right of the stiarcase where the hanging security guard is. If you've gone up that staicase and over to the Information Desk/News TV, then you've missed The Map. You'll need to go back down the stairs. As you approach The Map, you'll be prompted to Investigate, So hit the proper button, and you'll begin the Investigation Sequence. (It Involves Rosa and the whole bit)
You'll need to scan the Map, submit the proper Information: MEDIEVAL TOOLS 13A. This location will be added to your GPS and you'll get a PERFECT. So if you follow the guide as is, plus add this step, then all the commotion of this level will be a one time event.
Remainder of the Guide has been very nice, providing insight into the Chain Attacks, Environmental Kills, all of which are confusing at first, then become a fun edition to the game. The guide just helps you reach the fun part a little quicker.
You'll also get the lowdown on Multiplayer and the five "Fight CLubs" you'll unlock as you play the game. You'll get the breakdowns of which Mele weapons to use etc.
So it's effective, just not thorough.