Lots of people are very loyal to Apple, and I guess they're hoping that this version will actually finally be a decent one. They want a good phone, which the Android folks have been enjoying for a long time, so they're rushing out in hopes that the 6s will finally get it right.
Trust you to make a negative comment. J.D. Power's customer satisfaction ratings disagrees with you that users think that Apple are "not getting it right":
In the interests of complete honesty, for the first time in history, Apple and Samsung have been swapping back and forth for top place in customer satisfaction between the carriers, both within a few points of each other well within the margin of error of the study. In previous years, Apple has been significantly well ahead of all competition.
Apple has ALWAYS gotten it right. . . and the Apple iPhones have always been the #1 best selling cellular phones in the world. There is a reason.