Honestly not all that surprised, I just purchased a 6+ right before Christmas and its a nice device and all but in so many ways iOS is starting to feel archaic. What with the iTunes requirement for file transfer, the lack of app crosstalk (yeah sure you're going to address that Apple, thanks for getting my hopes up for nothing.), app integration with the hardware is terribly limited (nfc, Bluetooth, etc.), Apple not allowing many things on the App Store or apps to be installed by other means...
Lots of things make this experience so stupid and outdated. Something as simple as transferring files is a damn hassle, not to mention changing the ringtone.
One of the best examples I have is that I have a load of pictures on one app that allows me to view images in a sort of gallery and save them all very quickly, to just transfer a load of them to the gallery I would have to go through iTunes, move the pictures on my desktop, then transfer them to the camera roll through iTunes. It's silly. Sure I can "open in" but good luck doing that for numerous files or pictures! Can only do that one at a time.
So many things with the OS are just infuriating. Feels like I can't take advantage of the powerful hardware, of course the other area of annoyance would be the RAM. I don't even want to get started on that.
If it wasn't for me already having this phone and having to drive an hour and a half just to return it, my girlfriend having and using iMessage (along with pretty much everyone I know), and all that I would still do it and give android a shot, but as it stands I'm not sure I wish to be bothered by all that.
The note 4 is still very tempting though. I see it in ads and the like and I am very tempted by it.