If you talk to devout Eastern Orthodox or Greek Catholics, Erasmian pronunciation is something of an abomination. Since the Greek language has continually been in use in the East, what with the continual tradition of the Byzantine and Russian Empires, I trust Eastern clerics with the language much more than Erasmus or any other more recent scholar.
If one listens to Ecclesiastical Greek, it is much more natural and flowing, whereas Erasmian Greek is awkward, and very 'un-Greek'.
Us western Catholics are very precise about our Latin pronunication; be it Roman, German et al. Greek Catholics are no less precise with their Greek. Our languages are immesurably important to us.
I am not saying Erasmian pronunciation has no merits whatsoever though.
Thanks for your responses!