I think that if you want to contribute, they should at least be upfront on the processes, or even the absence of it. Some do not accept at all, some do only accept on bugfixes, and some are happy to extend the project. The chance of merging of course is a decent barometer for contributors who wants to work on projects who are allegedly open to contributions, but I will not use it as a barometer of the quality of the code itself (or at least as a minor barometer - never as a major one).