As someone who has spent the last five years working to actively promote Office 365 to my clients, it's really disappointing to see such a lack of beta testing, communication, documentation and interaction with end users. The issues I am seeing echo most of what has already been mentioned here (changes without notifications or guidance, failure of the Auto-Save function, Throttling, incorrect Status Icons, etc, etc). Workflows have been made unusable and usability has been thrown out the window.
I realise from reading the blog that some of these changes may be necessary and in some case are a welcome improvement but to roll out a wholly incomplete product with no warning, no apparent beta testing and a total dearth of documentation seems completely nuts. It goes against pretty much every ITIL practise and in a business environment if I was to roll out an IT project in this way I would probably be sacked. To make matters worse, from what I can see, there is no easy and clean way to uninstall the updated OneDrive and roll back to a previous version.
My clients are frustrated & furious and if they weren't so tied in to the Office 365 eco-system, they would look to find an alternative product for file storage and local synchronisation. It's such a shame as the product had been getting better and better and this has set the product back several steps. Shame on Microsoft, with so many resources, for getting this so wrong.