Perhaps now more than ever, with cinema ticket prices at astronomic highs, trailers are of increasing importance. For most people, a trailer will be the first impression one gets from a movie... A trailer shouldn't stand outside in its Y-fronts in broad daylight, swinging the script over its head and screaming the ending at the top of its lungs.
How does it rank against the other three films? Well it's possibly the best TF movie since the 2007 original. Long, yes; occasionally incoherent, (Mark Wahlberg seems to ignore full stops in his script), and it features some awful CGI - the enemy robots are made from gravity-defying blocks that appear to have no weight or heft, making them look like a bad video game cut scene.