A 2 from me, for a couple of reasons.
- Incomplete/poor beta testing. It seems each release fixes one set of bugs, but introduces another set.
- More importantly, no published changelog. If you don't want to make a comprehensive changelog part of the user's reader experience, at least publish it somewhere on the web, where those interested in the minutiae can view what's changed, instead of having to rely on voluminous "bug report" threads on Mobileread.