Really spot on about MoS. Instead of a CGI super fight, make it MEAN something. Just this change alone I think would have put this film in a much better light. Reluctant Superman comes through in the end, and makes a horrible choice in a no-win scenario and grows as a character because of it.
Now for Suicide Squad, I'd say the film was going on the right path (Waller is the villain, Enchantress is a loose cannon and incredibly dangerous) but was just a mess otherwise. Also Will Smith was horribly miscast as Deadshot, he just played his typical Will Smith character in this film.
SS should be an outlet to introduce villains without going too much into their whole origin and whatnot. Use it to give a glimpse at the various rogue galleries of the heroes, throw them at some OTHER set of villains due to bad intel or the like, and at the end of it all, show that everything that occurred is some chess game between Waller and Batman. To me, SS has the most potential to try different things and just have fun with it than any other DC franchise.