Anyone can vote on whether or not an article should be deleted but how many people actually do? I wouldn't be surprised if the vast majority of Wikipedia users don't know, and don't care, about Wikipedia politics.

If something is in the process of being deleted that I don't know about then I can't vote on whether or not I want it to be kept around. Wikipedia is great for jumping from link-to-link to find out new things and if the content is being deleted it's that much harder to learn. I didn't even know about the programming language Nemerle before and now the article is gone.

Knowledge shouldn't be voted on.