It's no secret that the MCU is gearing up for the Dark Avengers, but it's the Justice League that could demonstrate the art of the villain team-up more successfully. The DCEU famously — or infamously, depending on who one asks — chose to veer away from the winning formula that made the MCU so successful by jumping straight into Justice League without pre-establishing half of its roster. The result of this was a film that many maligned as mediocre at best. Now, however, with the canon up in the air and a DCEU reboot looming on the horizon, this can be rectified by focusing more on the franchise's villains.
The DCEU is in a state of flux. After the success of the Justice League Snyder Cut, it's obvious that the appetite is still there for it to continue, but some things would need changing. It's obvious from Justice League that the intention was building towards an eventual clash with the likes of DC's biggest bad, Darkseid. But it's worth mentioning that one threat the DCEU could have seen before him — and could likely still see carried out with resounding success — would be the Legion of Doom.
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The DCEU has one notable trait that Marvel absolutely lacks — villains. Although the merits of individual antagonists are debatable, what isn't up for debate is that as far as their cinematic universes go, the DCEU simply has more options because MCU villains tend to get themselves killed. If they don't die, it's usually because they're popular - like Loki — or sympathetic and non-villainous enough to spare, such as Ghost in Ant-Man and the Wasp. The DCEU, however, has a better track record of letting villains live, as evidenced by Shazam and Aquaman,
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