Sufism

The word Sufi means 'pure' in Persian. Its an Arabic word meaning 'wool' because mostly sufis wear woolen clothes.  

Junayd said, "Sufism is that you should be with God--without any attachment."
Concerning Sufism, Abu Muhammad al-Jariri said, "Sufism consists of entering every exalted quality (khulq) and leaving behind every despicable quality."

             It is a self-less experience and exploring the truth by the means of love and devotion about something for an age or for your whole life. Sufi is lover of truth and he cuts off from the social being and moves towards the perfection of truth by himself for his God. He is also known as the mythic of religion. He basically seek divine truth and love through direct or indirect encounter with God.  He loves the pure truth. He focuses on self-control strictly. Its his intention to go for divine love
                                    Sufism covers a broad range of things. Criticism begins here, some people say that its haram in Islam and its not a part of our religion Sufi s are deviants. They are not Muslims
  because Islam does not allow us to cut ourselves off from our families or fellow beings and go somewhere far far away to worship God. Some say that something against Sunnah is out of Islam because our Prophet (PbuH) hadn't had done anything like that. And Prophet Mohammad was sufficient for us to follow. Sufis are also inspired by music and music is haram in Isalm. Sufis worships on graves which is strictly forbidden in Islam and considered as Shirk. They made it a really complicated topic for us to understand.
 Here is link to Zakir Naik's vidoe in which he condemn Sufism.
           www.youtube.com/watch?v=pDu6ftHmd5M‎

From this I agree with what he is saying about modern Sufism. Sufis are taking it wrong like how they are worshiping God. Like he said Sufism might have a mixture of some Hinduism too which are Islam does not allow like music,dancing and using Sufism as ur profession. But it should no me be Haram to much of extent as its all about worshiping our God that is what he wants to but he also wants us to complete our duties and  to fulfill others rights. Many Sufis had also worked and helped to fight the bad and make a strayed people help to know their moral values and duties. But in the matter of fact its not clear yet because its a really vast topic. And according to most of Muslims its not haram if we obeying Islam's rules.