I uninstalled it, and it appears to have uninstalled fine.
The Disqus system is actually a decent system, my qualms were the process visitors go through to get to comment is like a big sales pitch for another system.
Another issue I’ve found with testing plugins and uninstalling them, is that many leave “_transient” and “_site_transient” entries in the wp_options database.
I tested so many plugins that this turned into a denial of service attack on my page load time, because the options list was loading over a meg of junk.
After deleting all these entries, the database for options went from over a meg to about 100k, and page load went from 5 seconds to half a second.
If you don’t want to manually manage the database, get some optimization plugin that will manage it for you.