Ratings are a big big joke and a Popularity Contest.
On that note, my ratings reflect my need to mess around with the popularity of certain shows due to a variety of reasons.
Something I’ve come across on mdl pages, people appear really aggressive with their opinions. Particularly if the overall rating or popularity (especially the most loved ones vs most bashed ones) of the show on this site reflects their own view. To the point of treating opposing viewpoints as invalid and brainless. I don’t think bullying people to conform to your opinion achieves anything other than turn people off even more.
Drama 🚩message/s related reasons for some of my 1 ratings (there is no doubt more problematic dramas out there but these have either very solid fanbases and are more well-known due to famous cast):-
Vincenzo - glorification of literal Mafia criminals, (also a little violence porn )
Lovely Runner - glorification of delusional sasaeng fan mentality among other typical kdrama issues like non-consent drunk kiss made to look romantic, justifying stealing other people's free will/decision power, stalker = romantic, breaking and entering = romantic, etc)
Forecasting Love and Weather - justifying/excusing/rewarding cheating AND workplace assault
Business Proposal - consent abuse & power imbalance couple with the one holding the power going on a power trip instead of respecting their partner. I'm reminded of why I despise the CEO-Employee trope. (Unlike the ML in KingTheLand who respected his FL and she in turn did not act like a doormat damsel in front of him. The ML in BP takes advantage of his status as employer and even at one significant point completely disregards consent, doesn't take NO for an answer and forces a kiss- at work and before they're officially dating to make matters worse. I believe there was some dubious consent issues with SL couple as well, though I don't really remember their plot now)
Melancholic - should be obvious really. Imbalanced power dynamic. Teacher leading on an underaged and already sexually traumatised student. Behaving inappropriately and not setting proper boundaries when the child in question is known to have feelings. I don't care if they meet later as adults. The root base of their relationship is already full of NOs this should not happen.
Mama Fairy & the Woodcutter (okay thankfully this drama isn't on most people's radar) - Messing with someone's feelings: Extremely demandingly and forcefully leading on someone to the point that they fall deep in love with you. Only to drop them like hot potato with nary an apology when you find out you were oops mistaken about their identity.