To be honest I usually avoid OP’s and ED’s. Basically, I skip OP’s and turn off the episode before the ED come on. The favorite OP I remember from my childhood was the old Dragon Ball Z opening and the original Pokemon OP. I did also like many of the early Naruto OP’s.
However, one series OP I did notice was Tokyo Ghoul Root A, why because it was terrible. The OP has music from Osterreich called Incompetence. Kaneki literally just stands in one place, the colors are pale, the changing background are cheesy to me. Kaneki’s face does change but it’s not interesting to me. I know that some anime seem to spend too much money on the OP but this is taking cutting corners too far. Regardless, this OP is forgettable.