Even when it's not majority, I agree with sgt that initially the experience was much, much better than with other apps, especially for the older people in my family.
It degraded a bit, however, with the time. Adding features is not to the benefit of the less young, whereas young tolerate UI getting more complex and less intuitive.
It's really not, at least in continental Europe. Here in Germany Android's like 70% of the market and nobody uses iMessage or FaceTime.