Ok, most of the internet already talked about Suicide Squad and The Joker, but there a few things that most of people get wrong about the whole movie, I'll try to show a some perspective about all this.

The GOOD

Fan Service all around

People tend to forget all the good things about everything and only focus to the bad, but read me out, all characters gave us all a very good amount of fan service and even if you are not a fan of those characters you liked those too, actually the most perfect fan service of all was the scene of Harley and the Joker dancing that was based on this art of Alex Ross.

Characterization

When we talk about characterization all sort of comments come to mind, but it they did a real good job, maybe this was one of the highlights of the movie. They didn't use the classic outfit, and we really need to be thankful about that, actually look of this comparison and thank for the new costumes.

Classic:

Movie:

The BAD

All the cuts, all the changes, everything that made us hate all people involved in the direction of the movie!
Why the cuts? Why the changes? Let me see... BATMAN VS SUPERMAN!

Don't believe in me? Ok, exhibit A:

Before BvS: [01/19/2016 ] Suicide Squad - Official Trailer 1

It was dark, had personality, but then, when the critics about BvS came... well... the changes came, the marketing of the movie became a little more colorful, as you can see in exhibit B:

After BvS: [04/10/2016]Suicide Squad - Blitz Trailer [HD]

In the end, was the public that said that was "okay" to change all the dark things to something more light.

The UGLY

In the "ugly" department we have a lot to put on after watch the movie, but hey, as I said early a lot had change in the final cut, that being said look at the first trailer and try to imagine the real path that David Ayer really wanted.

Actually, If you really think about it, every single person that was talking shit about DC movies, making comparison with Marvel movies, making jokes about all the dark things, those people are the ones to blame.

C'mon Warner Bros, why did you hear all the buzz?