Since it was mentioned, I have to say Coachella is just about my least favorite festival in the entire world, and I've been three times. It's not even the influencer hell, the footprint is WAY too small for the number of stages, tons of noise pollution, the tents are aggressively overpacked, the set times are consistently shorter than other similar festivals, it's hot as hell, in the middle of nowhere, and the most expensive ticket.
In the list of overrated festivals, Coachella easily takes the trophy.