I've had a number of bad sets of DR strings, but that's over 10-15 years of purchasing them on and off. I've also had bad Rotosounds, and even last night a bad Dunlop (ball end broke off the D-string). It happens, and it's not limited to any one brand.
Oddly enough, the Slinkys I had on my fretted L2500 were taken off after a month of use and now reside on my fretless L2500. They have stayed consistently bright from string to string MUCH longer than any set of DRs or Dunlops or Labellas I've had on the same bass. So, if I was to draw conclusions from my experience in the same way that so many in this tread are drawing, EBs are the best, longest lasting string ever, and DR, Dunlop, Rotosounds, La Bellas, and everything else are horrible and should rot in hell.
Obviously that is not the case; sometimes you just get a bad set. However, every set of nickel strings I've ever had, aside from the Slinky's and a set of Peavey Cirrus "thermal fused" (whatever that is) strings have died within 2 weeks or less of use. Pretty normal, and I have 8 basses that all get played regularly, so it's not as if I'm putting ALL my time on any single bass. Personally, I prefer steel anyway, but sometimes I'm cheap and don't mind a $12 set of nickels when they'er on sale.