Wikipedia – How Spamming Is Prevented

Of course WikiStats has this (for all languages). :) The top reverted/reverting users are at http://stats.wikimedia.org/EN/EditsRevertsDE.htm#table3 The full rankings should be somewhere in the huge CSV reports archives. https://meta.wikimedia.org/wiki/Wikistats_csv They're updated rarely though and the format is a bit obscure (needs documentation at Meta-Wiki). Still great for digging!

However, as noted, I don't think this is a requirement for anything.

Some parts of the Wikipedia are edited by bots. They are special scripts that can do extensive but unintelligent editing, such as updating links to other language wiki pages automatically.

This kind of information rich updates are created by real users. There are a lot of dedicated users on Wikipedia and most of these users constantly follow certain articles and constantly update the content. Commonly these dedicated users are experts, enthusiasts or professionals on the articles they edit.

You can examine the history page for the Roger Federer article to keep track of changes. Generally bots leave a special comment to the edits they make. So you can easily distinguish between a bot and a real editor.