His tweet doesn't sound very promising to be honest.
Watching this movie being a huge DC fan, combined with his awareness of us people being glued to his twitter, these two thumbs up indicates that the movie wasn't as good expected. Instead of writing a couple of encouraging words for his followers, which would be the natural thing to do if you were thrilled after watching it, he just managed to give us thumbs. What does this tell you?
My guess is that once the movie ended, there was no time for him to give us the words we were hoping for. Why? Because of the heated discussions that completely exploded once the lights turned on.
He gave us two thumbs up because HE liked it, but didn't knew how to communicate this to us in way that wouldn't sound disappointing.
Also, if it was truly awesome and you left the cinema shivering, you would have pushed the thumbs-icon AT LEAST two or three more times and also have some kind of miss-type. All of you Galaxy S6 owners know there are lot´s of icons nearby the thumbs button and due to the build, it´s pretty common to push the icons nearby isn´t it? Don´t know how the iPhone works though.
Do we know what phone he´s using?