It’s not just that Will Smith is the biggest name on the metaphorical marquee, but Deadshot ends up being one of the few Squad members with anything resembling a story arc.
Suicide Squad Review: There’s Poison in The Water
Neil Miller
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And that shows that the modifications in the screenplay were not a good job. They had a good movie, but lost it when they tried to improve it.

Keep it simple, DC, if you want the major public to like a movie: one character, one story.

Nothing more.

The Dark Knight was an exception. Sadly.