WCF

Raised as a usability problem by 5 people on Hacker News over 5 years (2011–2015), in 3 threads.

People raised many different problems with WCF, 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 5 complaints

Hidden magic in XML config files, must know how to turn off2015-05-20
Harder to develop with than earlier SOAP web service tools, a drag on development2015-05-20
Non-.NET interop breaks and custom date formats are error-prone, slow and unintuitive2015-05-20
XML configuration is a black art, poorly documented and buggy, so setup takes lots of work2013-08-21
Too complex to configure; needs config tweaks and blog searches to perform or send large data2011-03-30