As a Lumia 625 user on 8.1:
1. I miss the old photo gallery from WP8, where there was a big photo of yours in the background
2. It would be cool if we could use a slide bar to change the brightness, because right now it`s limited to Automatic, Low, Medium and High.
3. OneNote needs and update to be more like the desktop app, where you can draw or do more things, kinda like Apple did in IOS9
4. "Resuming"
5. Can't take pictures while filming
6. Can't set another app as the default one (camera, music etc.)
6. The call menu dissapears in the middle of the conversation and takes me to recent calls
7. Music app: I would like to see the albums kinda like I see my photos, 3 in a row, arranged in collums (like iTunes)
8. The ability to manage emails from Yahoo, Gmail etc. like you do in Outlook from Win10 (maybe there will be such thing in Win10 idk)
9. MSN apps need visual updates, they are boring and useless right now (the weather one tho is decent)
10. I cannot set a specific album of pictures to be seen on the live tile, but only All, One or Favorite Photos.
11. I hate it that when I set 4:3 aspect ratio in the Microsoft Camera app (NOT the Lumia one) the image just seems to shrink because it has those black edges everywhere. If you compare it to the Lumia camera one, you will see that the image is smaller and it's frustrating.