Well what I mean is that the intros, the world building didn't hurt IM2. It's that the actual main plot and characters were handled poorly. You could have the DCCU characters deftly woven into the story, but if the MAIN story people came to see (Batman and Superman on screen together) then you have a problem. They could cameo the Legion of Freakin' Superheroes and do it well, but if Lex sucks as a main villain and the Superman and Batman dynamic is boring or dumb, then you have IM2 level problems.