What do you think is the most Factors affecting in Google's criteria? I think, according to my opinion,
the backlink and the age of the domain, and the quality of the content, and you?
Have read it only now, because I am looking for a similar topic.
I don't know if I understood your question correctly. Google has under the menu item "Crawling and Indexing" the most important quite well described and answered very many questions.