personally, I like the Black, Yellow, Chocolate labs, but if you get a good dog, then you get a good dog.
I wouldn't be throwing around the genetic mistake words though. It's known as genetic variation. There is not a single pure breed domestic dog in the world anywhere. I haven't done much research on the lab, but I'm guessing that it is the result of many different breeds that people found traits in that they liked..... Anyway, my chocolate is probably the smartest dog I've ever known, and I've had labs before (all of them black I might add). Like I said, sometimes you get that good dog. I know it's not my training ability. It sometimes makes me sad that someone that was a good trainer didn't end up with Rusty. I think he could have been a champion in the right hands. I console myself by know that Rusty is happy though.
BTW, Rusty is chocolate, his mother was black and his father was yellow. He's definitely not part of an inbread group.