10 most disliked Arrowverse storylines, ranked
10. John Diggle's Green Lantern arc
What a letdown this was.
Arrow decided to give the fans what they wanted with a series finale that hinted at John Diggle eventually becoming the Green Lantern. Viewers had long speculated that he was destined to become the DC hero due to the nods and references the show made to Green Lantern John Stewart throughout its run, and the finale honored that. And honestly, it really should have ended there.
Diggle would recur in the Arrowverse after that through appearances on Supergirl and Batwoman, but he had a more significant role on The Flash when, after a number of appearances, he decided to choose his own destiny and renounce the Lantern ring. Sure, that might be a very Diggle thing to do, but it didn't need to happen on-screen after the Arrow creative team had committed to a different storyline for him.
Fans were super disappointed by the decision because, like many storylines in the final few seasons of The Flash, it completely undercut a lot of what came before. What was the point of the Arrow finale teasing fans with Diggle following in his comic book counterpart's footsteps only for The Flash to say "well, actually, no"?
9. Leviathan
Supergirl season 5 could have been the show's most ambitious. There was a new mysterious evil in Leviathan, the return of Lex Luthor, the Kara and Lena dynamic, and the timeline-changing Crisis On Infinite Earths to tackle. But the execution of the majority of its storylines made it the show's worst season.
The biggest reason for that was how underwhelming Leviathan were as villains. Billed as an ancient race of technologically-advanced aliens, they had a major reputation to live up to, but it never felt they came close to doing that. Not once.
And Jon Cryer was just too deliciously villainous as Lex Luthor for viewers to even care about what Leviathan was planning.