Looking back on The Suicide Squad and Peacemaker, overall, I think the humor works just for those medias, but I admit at times, some content in between felt a bit unnecessary. Overall, it was forgiven, given how fact-paced the dialogue scenes were. It would just keep going. One thing I recall from TSS that was a little...too much and kind of childish was King Shark burping out the...I don't know how to write this here...d#%%...
Well I wouldn't expect to see that in Gunn's Superman. It won't be R-rated. I hope Gunn has taken notes from here though. Take Joss Whedon for instance. Not that it's quite the same humor, but Whedon's "humor" or rather, lack thereof, often doesn't land well in his movies, especially his cut of Justice League...Joss Whedon's so-called "jokes" came out flat, awkward and just flat-out unfunny especially the "brunch" scenes.
The Snyder cut was very redeeming and free from all those dreadful unnecessary Joss Whedon bits. It was also a good idea that Snyder took out that "I hear you can talk to fish" line out, even though Snyder originally shot that.
I'm not against humor, and I wish Snyder had more of it in Man of Steel, and even BvS. The Dark Knight trilogy by comparison had way more humor in it. In BvS though, that one moment where Martha said she figured Batman was her son's friend because of, "the cape." That was absolutely hilarious for such a dark and underwhelming movie experience that should have been epic and fulfilling.
I hope Gunn's Superman's humor isn't like Guardians of the Galaxy either, but somewhere in between. Look at the way Adrian Chase was portrayed in Peacemaker versus Arrow's version. I just now remembered that Gunn liked neither Tim Burton's or Christopher Nolan's Batman.