The Turks and Persians (amongst others) always resent it when they get lumped in with the Arabs just because they are all Muslims. They get especially offended when ignorant foreigners actually call them Arabs. Thus it's no surprise to read the following opinion piece published in Turkey on the website for Hurriyet Daily News.

What Muslims world? As well meaning as it sounds, the term "Muslim world" is a trap. The president should disown this term... No one would creditably argue that Guatemalans, Germans, or Guineans are the same because they are Christians, and it's as nonsensical to lump Turks, Trinidadians, and Tunisians together simply because they also happen to be Muslim...
This term is not only an analytical error, but also a critical public diplomacy mistake. Islamic ideologues are the only group that strongly advocates the belief that all Muslims belong to a politically united global community... A Muslim World is Al-Qaeda's conception.

It reminds me of when I was in Turkey and I heard an American make an observation to a Turk along these lines (I can't remember the exact words)

American: "I'm surprised at a lot of what I see here. It's not at all what I expected in a Muslim country."
Turk: "Turkey is not a Muslim country! It is a secular republic in which 90-something percent of the country happen to be Muslim!"

The Turk was most emphatic on this point. He later went on to lecture us about how Turkey is the exact opposite of the Saudi or Iranian models which are essentially theocratic nations, while Turkey presents an alternate in which predominantly Muslim countries can choose the path of secular democracy. This was his view, not mine. I know that Turkey has its own problems, but I think it presents a better model than most of the other options.