Great points. I would say some of the most annoying new members are the ones that go around saying "you should have used [insert whatever hot tool] instead" aft

Great points. I would say some of the most annoying new members are the ones that go around saying "you should have used [insert whatever hot tool] instead" after spending an hour learning about a project just because they read it somewhere. It can take months before you understand the decisions and context behind a software project that has been maintained for a while.