It's personal taste. Some like the eccentric 'rebellious against high-high fashion paradox' attitude.
I've talked to Dan Single (Ksubi guy), and he seemed like a really nice and funny guy. Spoke to his girlfriend too!
anyways, denim wear wise, i love them. But some of their fashion is not my taste. I like more elegance and timeless feminine pieces like blumarine.
Just for interest, you should check out the Tsubi's first MAFW show.. You look at it thinking, I could design better stuff. no really. Check it out, and i wonder if you will think the same.