In the right fit and color hey are cool. The mom-jean stone-wash color can look atrocious though. I just bought a lovely pair from Macy's in a dark-faded indigo color. The new style fit better - the thighs are slightly tighter.
Whenever I look at the Levis in Kohl's or Macy's, I can't help but notice that the 501s always seem to come in the shittiest washes. I guess they figure that the 501 cut means dad jeans.