The trouble with any bloodline is, one person may make a breeding (based on "pedigree") that another person would never make (based on performance).
Repeated over time, even though both men have "X Bloodline," the first man will have a bunch of useless paper tigers ... while the second man will have true performance representatives of the line. When you have a bloodline that gets all over the place, like Mayday dogs, you are going to get this kind of a disparity in ability and results.
Then, on top of this, since most dogmen aren't all that bright, one group of dogmen will get together and see some dogs of "X Bloodline" rolled/matched ... bred by the first guy ... and the dogs will suck ... and they will actually believe that
all dogs of "X Bloodline" are that shitty. Meanwhile, another group of dogmen will see dogs rolled/matched from the second guy's yard, of the same "X Bloodline," and these dogs will kick ass and look great. Those dogmen will then believe that
all dogs of "X Bloodline" are great.
And then members of both groups will argue online that "X Dogs suck" ... and "X Dogs are great" ... and the funny thing is
both groups are right ... based on their frames of reference and what they saw
Thus, in the end, there is no such thing as a true working bloodline, that's still competes, that either "always sucks" or is "always great" ...
In the end, we must look at each individual animal, and if we're going to buy pups/dogs of ANY bloodline, it will always fall back on the age-old saying,
"Who bred them and WHY?"
Jack