I have never been very enthusiatic about the Big Bang theory but it was really big (sorry about that) back when I took my physics degree. It leads to a number of unpleasant conclusions: singularity, dark matter and the cosmic inflationary theory. Here is an article you might find interesting:
http://www.dnaindia.com/scitech/report-big-bang-may-have-never-happened-physicists-propose-new-theory-2060254