My last major Wikipedia edit was towards the end of 2008 when I got fed up with people changing the rules on what was acceptable. Many times I would add something, an image or text, making sure that it observed all the standards current at the time. Then someone changed that standard, so I had to change a lot of things to prevent it all from being deleted. When this happened for the third time I realised that Wikipedia is FUBAR. People are spending more time changing rules and making everyone else follow those rules than in adding any useful information or preventing vandalism.
My main specialisation is the films of Powell and Pressburger but that leads to all the people who worked with them and all the many subjects covered by their films.