I tried contributing and there are so many entrenched "don't touch my stuff" senior editors or moderators that it's often hard to do much of anything depending on where you are. I gave up after spending 40+ hours attempting to help clean up little known articles of a genre of music only to have 90% of what I did get reversed even though I am very confident it was within wikipedia guidelines. I was also harassed and accused of racism (by the subject of the article) after nominating his article for deletion because it didn't meet notability requirements.