Several lines of dialogue

Ben Affleck said that he didn’t work on the script, and that he didn’t bring anything new to the already existing material (even if he conceded, later on, that he did improvise at times). Can we believe him?
Not necessarily, because at times the dialogue seems top notch (especially when Bruce is talking to Alfred), while at times it seems more than weird (Lex Luthor’s lines).
The best example of an efficient dialogue, which serves the plot while also giving information on the characters, is whenever Bruce motivates his actions when talking with Alfred. We don’t learn the reason for his directly, but through several well-placed hints (how many good men stayed that way) and references (the feeling of powerlessness that turns good men cruel).
Unfortunately, these lines are undermined by the rest – which is a shame. And we want for Zack Snyder to learn from this Batman v Superman experience/debacle. We truly want that – but we don’t believe it will happen.
