Apologies for also jumping in on this thread...
Although you describe a problem with 'group pages' not sorting correctly, I've had issues with pages on 2nd level (send a demo video together with bug findings prior to release of v5.0.2500) which is still there.
(As said, I reported this behavior prior to launch and had a fixed deadline with regards to deliver a v5 website once the release date was confirmed. This little beauty alone costed me half a days work because I messed up adding pages in the right order and the re-ordering didn't work so had to start with a blank project again)
Hierarchical sorting goes correct on 1st level most of the time, but alphabetic (AZ or ZA) sorting is something the system doesn't understand. (video
With regards to list, unfortunately i certainly disagree with you. Steve showed a nice video about drag-n-drop not working, but take a look at this (video
In the last video I create 10 list items. As soon as you see me saving the 3rd item the list is no longer sorted as it should be, the follow items are also randomly inserted. Steve already proved that drag-n-drop reordering didn't work so I didn't bother to show that in the video.
If you take a look at the attached screenshots, you'll first see the default backend sorting (manually) with to the left - the output of the list on the website. Those 2 also don't match up...
Changing the backend sorting to Last modified, showed the list items in the backend in the proper way, but as you can see from the left website output it totally doesn't have any effect...