They can sound that way on a given day. They can also sound clear, open, and non-boomy . I would say they also sound best at low to moderate volume levels. For sure they will not fit everyone's listening criteria.
So sometimes you wake up and they sound good. Next day they are ungood. Tomorrow is another day, and it is a good one. But then they suck again.
It's not the headphones fault. It's just that the day is bad-.