Totally broken, the photos apps was almost perfect for me, but now, it's so annoying.
I used to download photos from the web/Dropbox/Whatsapp and arrange them however I liked in Camera Roll, but now, they appear as I want them in Recently added for a few days, then, they disappear in to the photos tab and get rearrange by time taken and location, well, that's so annoying, because depending on the data of the photo they are put out of the order that I had them in Camera Roll, and if I have no idea when the photo that I downloaded was taken, it's a nightmare to find them in the photos tab.
The worst thing is that, I don't really think Apple will bring back the Camera Roll, I hate it when they fix things that just work and make a whole new mess.