More control is a big source of value for a lot of people. Personally, I don't need a 2 year old to be able to use my phone, but I draw great enjoyment from being able to customise it to my tastes very easily. Don't like the stock keyboard? Chuck it out. Don't like the app launcher? Download a new one.

If you want a more consistent UI and smoother animations over that, then great - there's a polished, well made device for you too on iOS. Different strokes for different folks.