I have been using Lord blades for just over 4yrs now and never had a bad blade from them. Have I found some that didn't shave as well as others, yes I have. The Big Ben in particular was a very tuggy blade for me but I chalked it up to just not being sharp enough a blade for me...How many did you buy? Let us know if you experience QC issues. Lord is notorious for it.
I think Lord gets a bad rap from a lot of people saying that they have poor QC and most times it has to do with other factors of the shave!! Most guys that use a blade that they don't find sharp enough they just label it as a dud, give the blade a bad review, and then move on from it. Not every blade works in every razor!! I've been through the majority of 100 Shark SS, 100 Shark SC, and 2-3 tucks of Silver Star blades and have found them all to work pretty much identical in my Timeless razor and I get the best results from them versus Feather, GSB, Kai, or Bic just to name a few... Even though those blades were tuggy and rough for me I would never label them as duds to give them a bad rep, they just didn't work for me because of something in my routine and thats that!!