oddly, it's a bit lighter in tone than his previous films. Much lighter that MOS & BVS.
The added runtime is justified by the fact that DC did everything backwards and introduced more than half the league in the team up movie, rather than solo films.
it's a weird 'perfect storm' - it works because the franchise surrounding it doesn't work, and he's had the benefit of finishing the film many years after the fact; therefore being able to see the critical reception, and reconsider things over time.