I've been doing the 100 burpee thing for a while as ive been a member of Ross Enamait's forum for many years
It really is a competition against your previous self.
It is really hard to compare against others unless the standards are really strictly adhered to
The crossfit standard isnt perfect but at least its a standard
A really good variation is burpee box jumps, then you really will get some consistency with your burpees.
Do them onto a 24 inch plyo box and even 50 is challenging