I'm a Gradohead, so my first instinct was to bash these closed cans, especially when their marketing has less to do with sound quality than with a celebrity endorsement from the likes of Dr. Dre.
But fair is fair, and after listening to these, I'm not inclined to bash them just to bash them. I'm no expert in the field, but I'm secure enough to not have to thumb my nose at every passing train.
These headphones don't have the clarity of Grados, primarily because they're closed cans. They're also bass heavy - with big, boomy, midbass. But they're also fun and I consider them to not only imitate the Bose stuff but to outdo them (big hurdle there). Where Bose's on-ear headphones go muddy (because their cushions are designed to pull double-duty as ear plugs), the Dr. Dre's can be adjusted to "open them up," expanding the soundstage and letting in a lot more high-frequency detail. Would I use these to listen to classical? Jazz? Choral music? No. But if I wanted to rock out, I could do a lot worse. These are attractive, fun, cans. They won't replace my Grados but for their crowd, they perform as expected. They provide head-pounding bass that should be lots of fun when listening to rock or rap. They're not going to provide the level of detail you'd found in Grados, Sennheisers or AKGs, but I'd wear them over the Bose crap. For a lot of people (whom I don't care to insult), they'll be just fine.
Plus, they also have them in candy-apple red. Who could ever say no to that?