The "dirty" trees on the internet

I just wanted to put in a word on the difficulty of taking information from the ancestry.com databases.  The bottom line:  very few trees are checked for consistency.  And they are a mess.  For example, John Leete of Islington is listed with two wives, Jane Horneby and Anne Shute.  (Anne Shute is the wife of John of Dodington.)    So we are on a mission to "get it right" for the Leete clan.