The thing is that ‘actually good’ is something subjective, and that it WILL change what it means person to person. What happens nowadays is that every piece of media will be analized extensively for every possible flaw (and if none, create some), which will be magnified online as negativity promotes engagement. You can see this happening daily online, with everything. Then, the way the online hivemind works, people will associate these ‘flaws’ with the media product and society will enforce its opinion on the average user. It’s a meme to be negative about something, and our brains like to be part of the ‘in-group’ so it also feels good. You can see examples of this on every cult classic that was hated when it came out.