In that case I recommend that you read reviews from
non-fans, because as fans we all have predisposed biases (myself included). Non TF-fans who are less emotionally invested in Transformers may be more likely to give a more honest or unbiased opinion.
Because a good movie should be one where a person who has very little (if any) knowledge or interest in the source material should be able to view the film and still enjoy it (and fans would enjoy it on a whole 'nuther level). The first live action Transformers film was pretty much like this - I know a lot of non-TF people who went to watch the movie and enjoyed it. The sequels not so much - the best I've heard from non-TF people was praise for the visuals, but nothing beyond that. Although with AoE I haven't even heard that - as that movie had some pretty damn lazy visual effects.
Revenge of the Fallen gave us that visually spectacular transformation sequence where the Constructicons merged for form Devastator. A scene so massive that it literally crashed ILM's computers in animating it!

Age of Extinction on the other hand gave us that really bland looking "flying white blocks" transformation for the Decepticons and the "half the vehicle disappearing into sub-space" transformation for the Autobots. Even when you look at the first movie there was some really nice animation done, like Optimus Prime transforming in front of Sam and Mikaela for the first time. It's so cool seeing all those parts moving and sliding into position. Same with Bumblebee etc., but Age of Extinction was just so
lazy. If you watch AoE Optimus Prime transforming frame by frame you can see the entire rear section of the truck literally being sucked into his lower back. It's little wonder that the toys end up with unsightly backpack kibble because the screen model literally leaves them with nowhere else to put it!
