On the main site (Stack Overflow) I managed to avoid any problems with my contributions.
On at least one of the "niche sites" (Role playing games) I had a much less pleasant experience. The moderators are IMHO way too draconian in making everyone stick to the letter of the rules, which is a bit silly considering that while Stack Overflow is intended to be a _professional_ resource, I doubt that anyone career is at a stake if they use advice from a fellow gamer in their next game.
The problem is that whether a contribution is accepted sometimes seems to be more about luck than merit. I have lost count of how many times I have searched for an answer to a technical question on a specialised subject, found a question on SO that was very close to mine, optimistically opened the page, and then found it was closed on some entirely incorrect basis by multiple users, who apparently didn't even understand the question, before any answers could be offered.
