the quote from Bass was that you can't judge a film based on what you wish it was. I didn't say they needed to add more to Spider-Man 3, just that it could/should have been so much better. That's all
It's a murky line, but here's what I would think, using this new Trek as an example:
Valid criticism: The time-travelling retcon is shallow and added an unneeded layer of technobabble complexity that didn't serve the plot, only to muddy up a simple tale of vengeance and give it a bit of a 'sci-fi' element.
Not valid criticism: Instead of making this film about a time-travelling Romulan hellbent on revenge, it should've been about the Enterprise fighting the Borg.
One points out a problem with the finished product or its creative process, and offers similar alternatives that expand on certain elements of the work as is. The other is simply ignoring what was there and replacing it with a wishful fantasy which, to the beholder, is obviously going to be superior.
I walked out of the movie and came up with a completely different idea for a movie, that had the barest similarities (a big, evil ship tries to kill the Federation is pretty much all it kept) to what was there. That's why I've never brought it up because it's just invalid. I could have a FANTASTIC AWESOME MEGA idea for a movie (I don't) but it's not valid because it's just not based on anything the movie had.
A lot of people do the latter when talking about the STAR WARS prequels. It's why I've never seriously used my idea for INDIANA JONES AND THE RESURRECTION OF BABEL as a criticism for THE KINGDOM OF THE CRYSTAL SKULL. (My idea was better, dammit!) But I
do use my alternate take on THE MATRIX REVOLUTIONS because it's structurally, very similar.
This is just how
I feel about criticism. You can do what you like, but I think there's a difference between you 'dream script' and 'criticizing the finished work'.
But it's a murky line. I could easily make my "not valid criticism" valid by doing this: "It should've been the Borg, not the Romulans for two reasons: firstly, the Borg have tried to do this before. The reason it failed is because they had to fight all the way to Earth to time travel. This time travel to a more remote part of the universe and arrive, unnoticed, and begin their temporal war by assimilating the Kelvin. Secondly, the Borg homeworld is a planet that the Federation
would actually use a black hole on. It is not out of the realm of possibility for the Federation to kill the Borg homeworld, and the last remaining cube heads back in time to stop it. The Borg don't destroy Vulcan, but assimilate it. They assimilate Pike, who is saved and ends up in that damn chair. And finally, because the Borg are scarier than death and the fear of death was a theme in the movie." Now I'm discussing the elements of the movie. Am I right or not? I dunno, I just made this **** up. My point is, it's a murky line and the "valid criticism" police isn't going to kick down your door because you think WOLVERINE sucked because it didn't have Strong Guy in it or Mojo or something.