Not happy? Do something about it: try release candidates, report bugs, and help triage and fix reported bugs.
We didn't, however, realize that "patch" releases also have release candidates. I'd recommend following the rails blog (http://weblog.rubyonrails.org/) which announces release candidate builds too.
It looks like this release was quite fat, for a patch release.
I added "check rails diff" to my deploy todo list.
EDIT: I just noticed that http://weblog.rubyonrails.org/ doesn't have a way to subscribe by email. I signed-up by email with this site instead http://blogtrottr.com, in case it helps other here.
But seriously, can we at least expect moderately stable releases? I do not think that's too much to ask, especially for a framework which has, in the past, achieved that.