Authors of a plugin, which is used by a large community, should take their (implicit) responsibility on servicing their “clients” seriously before releasing a new version.
With Version 2 some major changes were introduced (here including a complete rewrite), which require an *intense* level of testing. I understand that there was a beta test phase, but I wonder, what has happened there considering the high number of major bugs which are still not fixed.
Now you see the results. A new version was released, many have quickly upgraded because of their good experience with the plugin in the past, and now the reputation of the plugin and its authors has dramatically dropped.