What's specifically bad about it is that there is no way to manage the files. If you accidentally upload the wrong video you can't delete it if you're a regular user. You'd have to ask the server admin to delete it for you. There's no way to set permissions on the files. It also has a tendency to fail on upload with larger files, even when they're under the file limit set by the server admin.
I spent a while digging through the code trying to add a button to the file browser so at least users could delete a file, and while I think the code to do that exists on the backend, I could never figure out how to access it and gave up.