Many have opinions about exactly that. But Keynes was far from one-dimensional, even if his big ideas are relatively easy to explain. John Cassidy at The New Yorker has written a splendid evaluation of Keynes, with his economic genius, personal foibles, and advice sometimes hedged about with cautionary remarks, in The Demand Doctor: What would John Maynard Keynes tell us to do now—and should we listen? If you are interested in economics and particularly in depression economics, read this rather long article and you will be well rewarded for your time spent. The article is largely nontechnical, demanding less prior knowledge than many Krugman columns require of the reader.
(H/T my neighbor BB, who frequently gives me her New Yorker back issues.)