The first two transformers movie are amazing, all characters, especially the transformers themselves are fantastic to watch and transform, the first two movies are nice alternatives to other action movies. Both the first and second film have great story-lines and all characters are enjoyable. Even my nephew who is six years old enjoyed these movies! Anyone of any age can easily enjoy these movies.
But the reason for the four stars and not five is because of the final film, 'dark of the moon'.
Sam who was the 'lovable' hero in the first two movies as now turned into a screaming baby, in almost every action scene he's screaming, no exageration. Megan Fox has left the franchise and has been replaced by a trophy girl, she is beautiful but cannot act to save her life and the relationship between her and sam is awful and not interesting in the slightest and all she does in the movie is scream for Sam's help, where as Megan Fox had her own story and unique qualities and had much more of a significance.
The autobots have seemed to have been 'dulled' down, Bumblebee almost seems static! The storyline in theory is quite good but lacks the 'energy' in the first two films.
The film drags on for way too long and the ending is terrible, for literally 45 mins in the film, sam and his girlfriend are trapped in a building, just screaming! The final film is just full of explosions and screaming.
All in all, the first two films are great, story lines, characters everything but the third film is just awful.