What this tells us is that depending where you sit on the political divide will determine what you thought of the speech.
Watching it on television, the speech didn't seem to gel. Cameron's main proposition was that all our problems are down to 'big government' but when he talked about particular issues or policies the narrative shifted. There was praise for some Labour party initiatives, echoes of liberalism and Harold Macmillan with references to Martin Luther King and Muhammad Ali.
It certainly wasn't a bad speech but nor was it a great speech. The key moments came when Cameron talked about the loss of his son and when he attacked Labour's handling of poverty in Britain.
If one looks at the polls we see the Conservatives holding up and Labour trailing behind. Perhaps that is the best way to judge the speeches success or failure.