Thanks for jumping into these new features and providing feedback right away.
@NO2 -- indeed, item #1 was part of us rolling out this new system. The splitting of ratings/reviews between "current version" and "all versions" should be in good shape now. Please do speak up if you notice any lingering issues -- and please be specific about which reviews are out of place.
As for the the thumbs up / down and flag for abuse buttons -- those are appropriate for use both by people who have and do not have the app. The thumbs up / down voting does work, but a given user can only vote once. If it isn't showing up right away, I imagine it is a caching propagation delay (try changing the sort option)
@gbevin -- we can't reproduce the issue you mentioned. If you still have that issue, can you provide a screenshot?