What I know: the karma system is broken, because it is very hard to provide a controversial opinion/fact without being mass de-karma-ed.

For instance, there is serious hate here about web interop with classic noscript/basic (x)html browsers (namely basic HTML forms with at best <video> <audio> elements, optional simple CSS, often a document which is a "semantic" 2D html table with proper ids for navigation, encrypted URL parameters are your friends).

And AIs...