The story in this film really does cater to my favorite types of narratives, even moreso than Civil War. Of course I would rate CW higher (duh) as it is so technically sound from beginning to end but my favorite types of action/adventure films tend to be those where the heroes kind of have a cloud of being screwed at the end but still fight to do a little good anyway. ESB, LOTR, CA:TFA, ALIENS, Face/Off, etc. Suicide Squad is obviously lighter in may ways than those previous films but in other ways it's every bit as harsh or moreso. If it had the execution of those former films it wouldn't just be one of my favorite cbm's it'd be one of my favorite films, period.
But I didn't think the editing was bad per se. I liked that we first saw Deadshot and Harley in the present to establish them as the "main" Squad members, then they went full flashback for everybody, didn't waste time establishing throw away characters like Slipnot, saved Katana's backstory for later, and didn't clog the finale with the fates of characters who ultimately weren't that important (the prison guard who helped the Joker.)
I actually really liked the flow and if anything was impressed by the non-linear approach to character development. The structuring of Diablo's arc was actually kind of brilliant IMO.
The only times I'd say I "noticed" the editing were a couple times you'd have a chill moment and then music would kick in and there'd be a sweet action sequence (like Harley in the elevator for instance) and then it would almost abruptly go right back to characters just walking or talking. I wouldn't have NOT inserted those action sequences, I just think they could have cleaned up the tempo segues a bit here and there.