`No Comments` plugin totally gets rid of comments. Just activate the plugin and it's all gone!
Disable comments on site globally with just one click. Comments can be disabled according to post type.
Temporarily puts your WordPress site into a "read only" state. Useful on multi-author sites that are in the process of changing web hosts.
This plugin allows administrators to globally delete comments (spam, trash, unapproved comments), enable/disable comments on all posts.
Default wordpress functionality for disable comments extended for post type based control.