I've been planning on collecting the DC Animated films series for a while now. I've heard good things about the Gods and Monsters movie, so that's on the list.
I think... I was talking to someone the other day, and I think I've figured out what the difference between the Marvel and the DC films are.
I get the impression that the Marvel films are, primarily, concerned with being good movies. That's not to say that they are shallow, or unthinking popcorn licks; I think the fact that people are so heavily invested in them as a franchise shows that they are more than that. However, aside from the Cap movies, most of the Marvel films aren't particularly... they don't force people to think about messages or themes in them.
It's not that they aren't there; they just don't push it in your face. If you just want an action movie? Great! If you want emotional stuff, or to analyse the films for meaning, you can too.
DC, I think, are more concerned with trying to make "Important Movies". After all, the Dark Knight Trilogy was a film trilogy which was "About Things", which had messages beyond being superhero action flicks. So, DC has been trying to ape that formula, which is why you get stuff like Man of Steel and Dawn of Justice, with their long, long, long-winded discussions about vigilantism, responsibility for destruction, etcetera.
Superhero films don't have to be -and in fact shouldn't be- mindless action films. Marvel has shown that you can do emotions and thinking movies in the genre. But I don't think DC has found the balance that they want for the movies yet. Man of Steel and Dawn of Justice were very much in the camp of trying to get across their "Big and Important Messages" first and foremost, which backfired spectacularly... so now they are scrambling to be the "fun" movies with the Justice League and Suicide Squad.