Evite

Raised as a usability problem by 4 people on Hacker News over 7 years (2008–2014), in 4 threads.

People raised many different problems with Evite, but no single problem has yet been raised by 3 people in 3 different months and threads.

Unreviewed issues were grouped by machine: Claude Haiku labelled each comment as a usability complaint, named what it's about and summed up the problem in a line, and a small model grouped similar problems. Nobody has checked them by hand. Expect mistakes.

The newest 4 complaints

Garbage ads and terrible UX make the service frustrating to use2014-05-02
Simple RSVP requires visiting the website instead of replying from the email2010-10-13
Confusing and a complete pain to use for first-time users2008-08-07
Creating invites is confusing, so some people won't use it at all2008-07-02