With half of its 10-episode season aired, it's clear that Swamp Thing is the most celebrated original series introduced to the DC World. Doom Patrol and Titans are great programs, but they can't be compared to the quality of the craft that brought DC Comic books' most unusual heroes to life.
The long-term plans for the Swamp Thing would have developed in the direction of a manifestation of Justice League Dark. However, followers of scary super-heroic will likely never reach this due to the termination of Swamp Thing.