1) the movie had a plot, if you dont think it had a plot period, you fail english comprehension.
Which I think no one seriously disputed here. Its not the lack of any plot what so ever but that Michael Bay as director doesnt even attempt to give it some substance (He very well knows what he is doing and hes feeling fine it as he said by him self quite many times). To say it that way I feel completely fine with it. I watch Michael Bay movies for the effects and asplosions, not cause of the deep and interesting characters but I can understand why some feel very "shallow" after watching any of his movies as I feelt that way after his Pearl Harbor accident ... no surprise that many of the Veterans hated his movie to the guts.
Underworld and Underworld Evolution which are NOT Michal Bay movies but just to explain some point are "entertaining movies" as well for sure. But no one would see them as movies with "much" substance even when the story usualy could contain a lot of more then just "pew pew" "slize some wolfes/vampires" throat. That even action movies can be filled with many interesting AUTHENTIC characters was proved by a lot of skilled directors just to Start with James Cameron which was known for his very action filled movies but still also known for good acting, see Terminator 1+2, The Abbys, Alliens etc.
2) it may not have been the awesomest plot ever, but its a 2 hr movie based on 30m cartoons and comics. the plot for the shows were always simple, if the movies did not have simple plots, it would not be transformers.
which means only cause the comic was written for 11 year old kidz it can not have some good acting in the movie and actualy dialogues that are "good" ? That the comic was not Shakespeare is clear. But I mean what they could have at least done would be to give a bit "more" explanation in the movie which also the comic did as well. I mean I am not a die hard Transformers comic fan but even I know that they have not always thrown something inside the comic for "just cause" you got most of the some information about it (who are the decepticons? Where do the Transformers come from, whos Unicron/Primus? Who are the fallen, what are their motives etc.)
3) in the cartoons, it was always about the autobots trying to save humans/planet from plans of the decepticons.
yeah about that part one can not complain thats true
4) they did change a bit on the robots on how they look both pre and post change, but in some cases its more coherent, and in some its not.
if I am honest for a movie they look awesome I mean no one as adult can really expect them to look in a movie like "this"