The epic story of Homer is twisted in the most extraordinary way.
The producers/directors, whoever, most probably have not read the whole Iliad.
Troy had so much potential; action, romance, greed, jealousy, a great setting and story, and yet everything was completely screwed up. What's more, they altered everything that was originally part of the myth; Agammemnon died at his wife's hands on returning home after conquering Troy, Achilles was dead long before the horse entered the city gates, and Ajax hung himself as opposed to being killed by Hector. On top of this, the battle scenes were unambitious and pedestrian, marred by the incessant Gladiator-esque waling music used in the background. The dialogue was laughable in the first five minutes until it became evident that it would continue like this for a further two and a half hours.
The screenwriters fell into a cheap manichaeism and with caricatured characters, they did not know how to create extremely complex characters in a dispute for power like Octavian and Mark Antony. Instead of making Hagamemnon a complex character like Octavian in Rome, the film turned him into a villain from Marvel movies. And the ending comes with a huge facilitation instead of accepting a tragic ending for Paris and Helen (since they changed the story) as it was with Mark Antony and Cleopatra in Rome. The two lovers escaped in an unconvincing way that would never happen in practice.