It is, very much so. I’ve been there three times in the past, most recently in early 2010, and always had an enjoyable time.
In 2010, I stayed in Konya. A bit cool, of course, it was January, but still nice. The tomb of Rumi is quite the attraction.
Some time back there was a thread that had to do with Turkey and one of the posters claimed that if you got away from the major tourist sites and went into small out-of-the-way places, the people hated Westerners (as if it might be risky to visit such places).
I've never been to Turkey although there are a number of places I would like to visit. I've also heard people speak well of the Turks to the effect that they are friendly and welcoming to tourists.