what i loved about se7en (without giving any big spoilers if you rewatch):

- the mood / atmosphere. unrelenting rain in the city.. ..suddenly and completely relieved when they drive out to the desert for the final scene

- the sheer imagination of those crimes, my god

- kevin spacey was an incredible bad guy and you could totally believe he was capable

oh as you mention brad pitt, another film i forgot is 'the big short'. Not just because it's the best explanation of the total simplicity of the fraud in the banking system, but its brilliantly directed and acted. Should be a heavy film and i guess it is if you think about it, but it's really a great watch.