Yes Greg, they are currently the most extreme group, which is why they are being given most attention.
Why are other groups less extreme?
"a current push by Al Qaeda's leaders to avoid such deaths for fear of alienating potential supporters. That was the subject of the dispute that led to Al Qaeda's recent break with its former affiliate, the Islamic State of Iraq and Syria."

What does that say about ISIS?

On this site, Israel tends to get more attention than much LESS extreme states.
Curious.