Watched it this avo with my wife. Had to endure her whinging all the way home about how it was the worst of the five. So for non-TF fans I think they are over it, as evidenced by the relatively poor box office figures so far in the US.
As for me, I'd rank it well behind TF1 and DOTM (which I consider tied for best in the series) but ahead of AOE and ROTF (which I still consider to be the worst).
Loved Cogman. Loved the Steve Buscemi, Stanley Tucci and John Turturro cameos. Was surprised about how big a role Anthony Hopkins had and thought he was enjoyable. Laura Haddock was a much stronger actor than the two previous female leads (and hotter).
I'm not familiar with the TFPrime ending so I was excited to see Unicron introduced.
However, while I don't go in expecting a great story, this one was very convoluted and there were one too many plot devices.
The ending was quite weak. Quintessa is a god and yet was taken out so easily by Bumblebee. Though I did like the credits scene.
There were too many Transformers in this film. Crosshairs was great in AOE but had basically no action scenes. Drift was an afterthought. And that Suicide Squad set up was stupid. Infernicus was easily dispatched, Combiners should be super hard to defeat.
I agree with Gok about the bad language (which keeps getting worse). For a franchise that is all about selling toys to kids, you would think they would make these movies more kid friendly. I would love to be able to see this with my 8 year old (though I see this doesn't stop some other parents).
In the end, this film lacked the moments that TF1 and DOTM had. I've read a number of people's reviews where the movie holds up much better on a second viewing. Will most likely wait for the Blu-ray.