BMW just launched the all new M5, disaster or still the benchmark?

A new BMW M5 is always An Event. It is exactly 40 years since the first ever M5 invented the super-saloon, and in all that time (and seven generations to date) there has not been a duff M5. But there is lots about the new M5 that is controversial. Does it look special enough? Is it too heavy? And was adding a plug-in hybrid powertrain the right call?