When Google was a Stanford University project, it was called BackRub because it used the number of inbound links to check the site's importance. Although the algorithm has expanded to include various other factors, you can be sure that backlinks do play an important part.
Yes,backline give impact on the site or blog ranking but it is part of way to have a good ranking.We can have a good ranking starting at first of our blog creation,by choosing domain alone can give a good position in google search if our keyword really power,a related keyword in our blog assist google spider to recognize our blog instantly.Thus,offpage and onpage optimization is to enhance better ranking in order to have more traffic.