Glee was supposed to be satirical and dark. But then bland (https://www.reddit.com/r/glee/comments/1df8qs/the_reason_people_hate_marley_et_al/), humorless (https://www.reddit.com/r/glee/comments/j4p645/rory_was_such_a_boring_and_one_dimensional/), and boring (https://gleeksandtheirconfessions.tumblr.com/post/99368427183/i-think-marley-is-the-most-boring-character-of-all) characters (https://screenrant.com/glee-worst-side-characters-reddit/) like Marley (https://glee-the-new-york-story.fandom.com/wiki/Marley_Rose) and Rory (https://glee.fandom.com/wiki/Rory_Flanagan) were added. Their additions may have been fine had there been an ounce of irony in their performances and not played completely straight.

I didn't find Marley's character that too boring, even if she was declared to be a lukewarm, which is not a correct concern. At least her singing was strongly talented than Rory's TBH, IMO. The hatred on Marley Rose character was officially wrong.