Yes, it does often seem to come down to the highlighted point: Extremism within Islam is not as small as it is within Christianity (although given where Christianity is expanding and declining that may change back to historical norms more comparable to modern Islam).
Increasingly though I think that calling for an Islamic "reformation" is not the appropriate language and rather like the suggestion made by some other users here, that Islamic regions and cultures and the like are simply in need of enlightenment. The Protestant Reformation, after all, gave us extremists who wanted to purify the faith by purging it of heretical elements, both within Protestantism and the Counter-Reformation, not so far a cry from the Sunni extremists calling for sectarianism and jihad.