how many comments?

[jozzy]

Is there any chanse to see how many comments some user has wrote?

something like, most active user or something?
etc...

best scored user of posting comments?

best regards
vlada

[Joachim Müller]

You can see the comments a user has posted by going to his profile and then clicking on "Click to see all comments made by XXX". Go directly there by entering http://yourdomain.tld/your_coppermine_folder/thumbnails.php?album=lastcomby&uid=XXX where XXX represents the ID of the user.
However, there's no stats page that shows a list of top comment posters or similar. If you need this, you'll have to code it.