Effort is not a problem. 
What is problematic is pedagogy, because each image is different, and the tastes of each are different. One will prefer a natural image - one that the photographer has seen - another prefer an artificial image with reinforced chroma, accented contrasts, visible perspectives.
For all agorithms that are not “natural” (Retinex, Tone-mapping, and some parts of Wavelet), this problem will arise.
I will add to Rawpedia, at the end of the current sections Retinex, a summary of recommendations and an “average” frame.