Photos not allowing to add or edit location data
The new Photos app does not allow location data to be edited or added.
For those users who own a camera without a GPS, there is no way to add the location data to the photos which defeats the purpose of having the map function if some/most/all of your photos can't be included.
I spent a great deal of time updating my locations, using the Location Manager, in iPhoto only to find that they have been replaced with simplified locations. For example, Waterworld has been replaced with a Suburb/State location.
The new app has severe limitations compared to iPhoto. As bad as iPhoto was, these limitations make it extremely hard to work with.
Apart from the location issue above, photos can only be sorted by name. In Event view, any new events are added to the bottom of the list. Faces are ordered by, what appears to be, the number of photos associated with the face. So when your adding faces from the suggested faces, one has to look closely at the faces to find the face to associate the photo with. If the library contains a lot of Faces, then this can be a difficult task. Also, when selecting faces from the Suggested Faces list, multiple faces cannot be selected and each photo has to be moved, or ignored, individually.
I had a smart list which showed all of the un-named faces but that has gone and there doesn't seem to be a way to show all of the photos with named faces other than to go through each photo individually.