Earlier quoted context omitted.
Why is it superior to the Kindle app?
When I tried it awhile ago, the Kindle app had a page turning experience that can only be described as maddening. Tap in the wrong spot, boom, page has turned. The iBooks app, for all its over-done skeuomorphism, makes interacting with the book pretty easy. Simple things like page edges make clear what will happen when you tap in a particular place. iBooks just feels really nice. More than that, the Kindle app is jus…
Perhaps it was just a case of familiarity and the majority of the reports at that time being by existing Kindle users. Apple has also pushed out a few good updates since (including proper hyphenation!) so that has probably helped too.