I agree, and some postmodernists agree also, that the Enlightenment was not a failure.

The problem with 17th and 18th century enlightened thought, is that it is not so much a failure, but that people do not know how to interpret and articulate those ideas, principles and values in 21st century ways.

For example, even you make the mistake that progressivism is enlightened thought.

It is not. 

Progressivism is an ideology. Ideologies were designed to undercut enlightened thinking. You conflate liberalism with progressivism.