Unsubscribe templates design
The two unsubscribe templates (the one that asks you for confirmation and the one with the ok message) have such very basic styling that makes this feature almost unusable. Just using the same styles as in your main site (fonts, colors) would give a much better impression.
Tri Dang commented
In addition, it would be great to edit the generated unsubscribed template such as text, adding images, header, footer, etc.