Islam is a huge religion with many different branches that is practiced in variations in many different countries. It's very hard to form an opinion on so many people that are practicing such a wide range of religious habits. Just like Chinese Buddhism is very different then the one practiced in Tibet or India, Islam have a lot of different styles.
Reading the Koraan, the basic story is very similar to Christianity and Judaism, A monotheistic religion that believe in an omnipresent omnipotent inviable god, who's words and order comes to the people through a profit.
All those 3 religions, though describe a lot of battles and violence, basically advocate peace and non-violence, and in all 3 names a lot of horrible violent and hateful acts were made.