Wikipedia hardly has false information and most of the people who say it does are usually repeating what someone else told them.
If you're concerned about a piece information being incorrect, follow the references and read the comments on the original source (if it has comments), or just do some manual researching in google.
If you're 100% sure a piece of information is incorrect, fix it; just because pages are editable by anyone, it doesn't mean every edit is bad information.