Overall a research paper must be good enough having new idea, better presentation, sound methodology, fine results and discussion, followed by conclusions and recommendations.
However, as per your query results and discussion section must be strong enough for a research paper to be get accepted in a good journal.
Results and interpretation of results are very essential for a good manuscript. This will give meaning and values to your work. Introduction is more of literature review (copied work) and the methods used could be existing methods that are not new. As long as the objective (result) is achieved and you have the ability to interpret it in relative to its relevance to the society then you should have a good research work.
As I think all chapters of paper ( methdology, results and discussion) are important and each one completes the other in order to prepare a good research.
I believe that the quality of all items (the idea, title, abstract, introduction, methodology, results and discussions, conclusions and references) is important.
Who can inform what makes manuscript more acceptable in good journals, methodology or results presentation/discussion? To me, methodology is the backbone of the manuscript and increases or decreases the possibilities of its acceptance in a high quality journal more than the other parts of the manuscript.
Is there any bias factor from the reviewers? Bias cannot be ruled out.
First of all is the topic is important and interesting? and abstract writing is very crucial as it will give the primary impression about the write-up.
Secondly, the methodology is sound and enough explanation?
Third, whether the result is discussed interestingly and enough comparisons? overall the limitation and strength of the study is also very impotent.