The recently Der Spiegel article on ISIS written by Christoph Reuters, though it preoccupies itself and thus covers mainly structural investigation of the group based on ‘found secret documents’, does provide a worthy answer to ‘what ISIS really wants’ (‘relative great power’) than Graeme Wood’s ‘over-publicized’ article of same wording published few months ago on The Atlantic which claims it seeks ‘end-of-world clash of religions’ (so to speak).
I, personally, and any other worthy professional, would highly recommend Messr. Reuters article over Messr. Woods rather ‘over religious-themed’ and poorly presented as well as argued article.
Updated Sun Apr 26 2015 The Islamic State’s Baathist roots