Many, many new users get frustrated by their deleted comments, answers, closed questions, etc. I've heard a number of high rep users complain about HNQ voting from the 101 rep users. I don't think this is fair to complain about 101 voting, but I do think it raises an important issue; IPS can be a confusing place for new users. We are stricter about commenting (read suggesting improvements) than other sites, we can't answer questions about mental health, and our standards for topicality aren't always intuitive and can fluctuate.
Let's make the tour a requirement before any activity is allowed. Anyone who has not yet earned the Informed badge will get a message directing them to take the tour when they attempt to vote, suggest improvements, ask a question, answer a question, or flag content. As extra credit, we could even create badges that indicate you have read the help pages relevant to each privilege, and make those badges requisite for using their respective privileges.
If we implemented this feature, it may require a bit of a redesign to our tour page - at the very least it should point out the extra requirements for each privilege and provide links to fulfill those requirements. I don't think this feature will solve all of the new user issues, and it will probably slow down new user participation, but it will reward users who are willing to read the rules and follow them, and discourage those who don't wish to play by the rules.
Edit: What I'm hoping this feature will achieve is to end the cycle of new users that only go back and read the rules carefully after they have had a number of comments removed or questions/answers closed/deleted. The goal is to divert them before moderator intervention is needed.