I know people who didnt enjoy the new one, simply 'cos they were expecting a 'good' film, if you know what i mean.
It's transformers, i went with no illusions that the plot will probably be bad, the script a little wanting...... but who cares?
For me i see it as anyone who grew up watching transformers at an early age, the films are all about seeing those childhood heros back in action. Making you feel like a little kid again watching optimus prime and bumblebee kick decepticon ass!
Any film that can make a grown man feel like they're 5 again in wonder at huge ass robots is a good film imo, no matter what failings in other areas it has.
Don't expect anything but to look at pretty cgi of cool robots and you'll love the film as i did.