I thought all of Oil Ocean Zone was bad. It was one of the worst levels in Sonic 2 and I could have done without it in the game.
I love Dark Souls, but I swear that the first encounter with Seath the Scaleless is garbage. Not only do you just have to die, but if you don’t wear curse resist items, you get cursed and then dropped into the next area where you cannot return to Firelink Shrine to buy a Purging Stone if you don’t just happen to have one.
There are a couple of other moments in Dark Souls that are also kinda garbage (Covenant of Artorias, the first mimic, Pinwheel boss). Still, it’s probably in my top 10 games of all time and I love it dearly.