Is there any decent R.U.S.E. free strategy guide?
I haven't been able to find a decent free guide on Google.
Solution 1:
The Ruse Wiki is a great place to start, its free, community driven, and should continue to expand. You can find it here, and you find can a list of in game tactics here.
Also, Arqade is a another great place for strategy because you can answer focused questions. To get an idea of the quality content you can get for free, look at the Starcraft 2 question: What are the popular build orders for Protoss in StarCraft 2?