Before I start I'm not here to BASH the movie(or review it), I'm just want to give some quick thoughts on problems I had with the set up/plot of the movie and how I would change them. OK, with that out of the way let's start, my first problem was it wasn't really true to the tone of the comics. In the comics the Suicide Squad aren't really the savior a of the world as that are in the movie, their a covert black ops team. So wouldn't deal with threats like the enchantress, that's where the Justice league and other HEREOS come in, they are the savior a of the world. I understand in the movie that weren't initially sent to take down the villain but wouldn't other heroes like batman,Wonder Woman( who randomly showed up for doomsday), and the flash show up if such a big threat appeared. The suicide is supposed to do what regular soldiers and even Superheronews can't do. They do what may be considered morally wrong.
The second problem is if they were going to change the team to be meta-human stoppers instead of a black ops team, WHY WERE THEOR ONLY TWO META-HUMANS ON THE TEAM. When you look at the roster of the team there's really only two powered people Diablo who has fire powers, and killer croc who eats people. The rest of the team which includes Deadshot who's got good aim, Harley who has a bat, Boomerang who's crazy, Rick Flagg who has guns, Katana who has a sword, and Slipknot..... Who dies fast. A team that would work perfectly against other humans but poorly against powered people.
So in order to keep this great cast of members we simply change their mission. If I were to change suicide squad I would send them on a covert mission to another country say...Egypt, where that must take out a corrupt leader. But their mission fails as the Joker Interupts causing them to travel the world to take him out. I know, i know that not a detailed plot, but an example of something that could be done that is simile to the style of the comics.
Now for my last part I'll explain how I would have change the characters specifically. To make Harley more interesting I would've had her seperate do from the Joker by choice, leaving her haunted by his constant appearance. I feel this not only gives the Joker more relevance in the movie but also makes him more sinister, plus it gives Harley more character than the jokers girlfriend. I would change boomerang to be more similar to his appearance in the awesome animated movie Batman:Assault on Arkham, where he was constantly challenging Deadshot for control and wanted more respect. I would want killer croc to be bigger and the muscle of the group playing a role similar to the Hulk in the Avengers. I would leave Diablo the same except for his "family" line, Personally I feel the squad should be a family like how they call themselves in the movie it is a constantly changing team of VILLIANS. I would leave Dead-Shot alone, and take Katana and Slipknot completely out of the movie.
In conclusion I felt the movie could have been better if it was a team on a world wide mission, with the joker as tha main antagonist. If I could pick and VILLIANS for a possible sequel I would want Deathstroke, Mr.Freeze, or King Shark. Thanks for reading!!