It would have been better if it developed the main character more
I felt like I didn't give a damn about the main character. He "killed a pimp". Is that all they're going to say? Did the pimp actually do something to deserve getting killed? What about why he was so strong? Did he get all powerful just because of that machine and the memories of his ancestor or was he always strong?
Also, why did the other assassins wait for so long to escape when they were so powerful?