I swear the M5 is the most overrated car of all time.
Yes, it is a fantastic 4 door saloon, possibly one of the greatest 4 door cars ever made. But is it the best performance car ever? It'll probably be in the top 40 or something like that, but it can't possibly compare with proper sports cars or other performance cars.
Its awesomeness only really comes when you think; "Damn! This thing has all the practicality of a big executive saloon, but goes like a super car...".
And that's why the M6 is less awesome. Because its got sporty GT aspirations, 2 doors, equally big and fat as the M5, has the same 500bhp V10 as the M5, got slightly better dynamics than the M5, costs 80k pounds (30k more than the M5) and yet it is slower than a 911 Carrera round a track.