Weighing in here, I think it is a shame that previews are no longer discounted. It is the same here (in Australia) and whereas preview tickets were once heavily discounted, they are now close to full price and producers appear to do their best to not make it obvious that the audiences are at a preview. I think producers should discount tickets to all previews and make no bones about it that they are discounted for a reason - that the show is a 'preview' of what the finished product will be and technical hitches are likely.
That said, as it WAS a first preview, I think people need to accept this and not harp on and on about technical faults. I totally agree that the audience should not have paid full price and there should certainly have been compensation for those who bought the tickets if it was once an actual post opening performance date. However as it stands it WAS a preview - end of story.
It has even made the free papers our here which is plain ridiculous. It truly appears to be a case of tall poppy syndrome whereby because so much money has been spent, or some think that the director is an egomaniac, then the show deserves to fail.
I do not think any reviewer should post their opinions on a preview - unless they do so for all previews. It just reinforces personal vendettas and is in a way, bullying imo.
When there were issues with the bus during the Priscilla previews here in Sydney - many audience members were outraged and compained and said that the show would flop. That turned out to be a major success here (mind you, the producers gave away a LOT of return free tickets to those who complained which imo is the correct thing to do). There also wasn't a member of the press with a bee in their bonnet whining about the first preview either.
Mind you, I have no idea how any show could have a budget of $65m.
'Downtown Elaiggghhhy?'