Appropriate Signal to Noise Ratio for CMB Measurements? (Wmap, Cobe, Planck)

[The victorious truther]

I'm fairly unfamiliar with data processing and data analysis in astrophysics so i'm unsure how to address certain claims as to the veracity of astronomical measurements. The paper by a crank physicist named Pierre-Marie Robitaille got me thinking. What is a respectable signal to noise ratio in astrophysics and, in particular, why a ratio of less than 2:1 for the Wmap data could be then considered an accurate recording of the CMB? What could be considered a standard in astrophysics for a signal to noise ratio that would indicate an accurate reading? If you could supply some extra reading material at the undergraduate level i'd appreciate it. 

802260431_PierrePaper.pdf