Ok so I know that the issue of instant upload not uploading all of the user's photos has been brought to the attention of the Google team but I have some suggestions for the photo sharing beyond that.
First of all, as far as I can tell there is no method to edit albums from the mobile android app. I would enjoy having this feature so all my photos, even though they are sorted by date aren't just in the 'from phone' section.
Secondly I think you should be able to upload photos to G+ without having to share them publicly or with a specific person or circle. I would also like to pick which album I share it to from the share menu.
These are just some things I would really like to see in a future update so I can use G+ as my primary photo backup client.