Wel, I don't mean to say that there are "absolutely" no bad pipes. I've had to let go of a Pete with a green wood taste once. I've had a Viprati that had the draft hole collapse, but it was n the burn out catagory. Sure, sure, loose stems, etc.. I find that bent pipes, and pipes with chambers in the drafts, like for filters and such do tend to gurgle more, but there are guys who love these turbulent drafts and can smoke them gurgle free. Buttons and slots are more in the "apolostery" category for me. It doesn't make the engine run bad, but it does make for a comfortable ride. I'd say the pipe plays about 20% of the experience, and tobacco choices and the smoker's skills makes up the rest.
Someone who has learned to drive small sports cars will say that a new pick up truck doesn't drive well, and vice versa. Same with pipes. I find that Beckers and Castellos fit my default style of smoking best, but I can enjoy a cheap ass Stanwell, or Chacom, or Grabow, or even a bent pipe also. I enjoy learning how best to smoke each and every pipe in my collection, which is well over 100 pipes.
My comment just comes from watching people cast off horrid smokers to someone who finds the pipe to be amazing. I've heard this way more than someone who has found a pipe that no one can smoke, which I have never heard.
I have big drafty drilled pipes, thin coffee stirrer drilled pipes, odd wide-thin-wide drafts, etc... and, I have found this to just be a minor impact on my own smoking experience. And, when talking to pipemakers who have come to the Briary to talk with us, I ask about drilling sizes... there doesn't seem to be some technical formula that any of them use to determine draft size, drill size, etc... sure, some have unique ways they drill and finish the holes; however, I have never heard someone say that it was any more technical than just that "that's the size I use." And, The Briary has had some big names come through.