If you want a goofy movie with tons of violence epic made by James Gunn you'll love this one. He knocked it out the park. Very straight forward movie. Probably the best movie of DC's lineup this far. This film knows it's for a fun time and let's you know in your face. Need more R-rating Gunn movies.
Also if you've never seen the other Suicide Squad, you don't really need to watch it for this one to make sense.