You give me six Centurions and it might not change the course of the war but it'll sure rip the guts out of any Wehrmacht armoured assault.
I'd take a Centurion Mk. 3 over 3 Panthers or Tigers any day of the week.
Too often in these sorts of comparisons, the role of the crew and commander are ignored. A really good crew and commander can win an engagement with a popgun if faced with incompetence and complacency. A poor crew and commander will never win, no matter how good their tank is.
The Centurion was not a super tank. It was a good, well balance AFV. It never had the FCS it should have but that was a consequence of the belief hat conscripts could not be trained to use an advanced fire control system. The ranging MG was adequate and nothing more. If they'd installed a good coincidence rangefinder and trained the crew to use it properly, the Centurion could have truly shined but they never did.