Mono

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

People raised many different problems with Mono, 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 7 complaints

Couldn't find a way to enable package restore; had to run it manually2014-08-13
Mono runs very slowly, making it practically unusable2014-07-07
Clipboard copy and paste doesn't work between Mono apps and native OS X apps2014-04-28
Setting up a development environment on Mac is possible but challenging2013-10-10
Assemblies in the GAC aren't found at runtime, forcing static linking and manual setup2010-12-15
Mono lacks some .NET features or behaves slightly differently, making it painful to use2009-04-09
Users click the logo instead of the text link, and then struggle to find the latest version2008-09-13