First of all, Theseus was not a "bastard" as they call him. His father was the king of Athens (Aegean) and he certainly was not a peasant since he became the king of Athens himself.
Second there were 12 gods not 6 and I've never heard of Zeus killing any other god or about the law of not interfering with humans. Gods loved to "play around" with people.
Third: as soon as I saw the so called Titans I felt like leaving the theater. The last time I checked, they were not blue people who jump around like monkeys and have no intelligence.
Fourth: I am not a racist. I have friends from all around the world but using an Indian actress as Phaedra and black people for warriors feels out of space. I repeat I am not a racist but in a film "based" on Greek mythology they could at least use actors that resemble the people of the country and since the priests were talking in "Greek", they could at least make it sound like Greek. It took me some time to realize they were not talking in an alien language and when I did, I still read the subtitles to understand what they were saying, even though it is my first language.
I do not want to over analyze the mistakes concerning the mythology but I have to day that Phaedra was not a priest but a princess and Theseus definitely did not bury his mother in the labyrinth of minotaur which is in Crete, minotaur was not a man with an iron mask on his head and Theseus did not follow his own bloody traces to leave the labyrinth.
I could write pages about mythology but I will stop here. Other than that, I did not really enjoy the fights much. I must say that some of them were amazing but most of them concentrated on showing too much blood. If you enjoy watching people chopping off body parts and literally smashing people into nothingness in slow motion then this is a film for you.
Also, there was not depth in the characters. They are all shallow and you can easily guess what their choices they will make or how they will react to certain situations. The same goes with the plot. The ending is pretty much known from the beginning there is no mystery at all. We learn everything in the first 20 minutes and then just watch several fights until the end.
All in all, the makers just used some "famous" names from the Greek mythology and created a lot of violent fights in an attempt to gain the attention of the viewers.