This reaction doesn’t really come as a surprise. Quentin Tarantino showed fans eight minutes of The Hateful Eight at the weekend, which has thankfully remained off the Internet. If it had come online, you know the man who almost scrapped the film due to the first draft of the script making its way onto the internet would refuse to bring anything else to future cons, and his subsequent tirade would have songs written about it in the future. The thing about these exclusive sizzle reels is just that, they’re exclusive. They usually come at the end of the production cycle, more often than not when the movie is nowhere near finished, and really act as a taste of what to expect. The VFX is not finished, the colour grading is not quite there, the sound mix isn’t completed, so it’s not a great example of the finished product (Ryan Reynolds has said exactly that about the Deadpool footage, and also says we can expect a trailer to be released to the public in three weeks). What they do is reward the fans who are there with something not a lot of people will see, and, of course, creates buzz that builds the anticipation for when the first footage does come our way through the official channels.
Of course, there was plenty of footage officially into the wild from the event. The new Batman v Superman: Dawn of Justice trailer probably made a better job of breaking the Internet than Kim Kardashian ever did, and Lucasfilm and Disney hit upon the ingenious idea of releasing magical behind the scenes footage that pushed anticipation for the continuation of the legendary saga to new levels. This was calculated, and really is how the footage should be viewed. No matter how great you think it looks and how pumped you get for the movie, you are still watching it on shitty resolution, projected on a screen with a camera that is properly shaking more than a Michael Bay filmed action scene (we love you really, Michael). It’s gonna affect your opinion. So if you’re at one of these events, calm down, put the phone away, wait a few weeks, and let everybody see it, the way it's meant to be seen. You’ll feel much better for it.