Is Sperm quality important for conception success, and are there ways to improve sperm quality?

Most male problems are not amenable to treatment for improving sperm count as doctors say,and will require some form of assisted conception in cases of failure to achieve pregnancy naturally.
However, if male infertility is suspected to be a cause of non pregnancy, then using natural herbal treatment may improve chances for natural conception and hopefully avoid the need for assisted reproduction methods such as IUI or IVF or to be used alongside with IUI or IVF.