Darvin: How was that strategy guide? I recall Prima products were really inconsistent.
Well, why not make that determination for yourself? It's a free 30MB download. It wouldn't take much to figure out. I'm providing it for the sake of completeness to people who purchased the game in case they want official information on how to tackle various parts of the game.
That said, to answer your question, it seems pretty decent. I know what you mean where some guides are just truly useless and not helpful at all. This fortunately doesn't seem to be the case here. Each level has a short narrative of "How we beat this level" told in a historical fashion. It's not as nice as having a "Just do this" sort of approach, but you can easily extrapolate that from the write-up.