A couple of cents: before I "got it" I didn't even know what a good smoke was, and all my smokes were bad: tongue bite, mouth burn, burning too fast, not burning at all, gurgling, blocking.
Now with my limited experience I rarely if ever have a BAD smoke. If I do it is down to factors other than the pipes, usually having to do with my mood at the time, or packing a new tobacco wrongly (too tight).
Of course there are the occasional great smokes, where everything clicks into place and it is a sublime experience in every way, but I've had good, great, and mediocre/bad smokes in the same pipes, with the same tobacco, so my conclusion is that it is never one of the pipes, it is always something about me. I've had mediocre smokes in the best possible environment, and great smokes just walking my dog or sitting on cold concrete. If I'd rate my track record I'd say 5% are mediocre/bad smokes where nothing is working well but I usually figure out why afterwards, 85-90% good, but not amazing, and 5-10% great smokes (that's about 1-2 great smokes per week).
It is too many factors other than the pipe, maybe I've been lucky, I don't own anything expensive but they all pass a pipe cleaner test and all have been consistently delivering good and occasionally great smokes since I became not bad at pipe smoking
I'd say it has some similarities to cooking, in all the years me and my wife are cooking there have been times when the same dish, with the same recipe and as-close-as-possible ingredients has been tasty, but no more (a good smoke) and some other times where it was so good that we, or the friends we shared it with, remember how good it was years later.