I may not be discerning but I find all of my pipes are doing a fine job. I do recall a GBD Billiard Century that was better than any pipe I had. Dropped it and broke the shank. I was so disgusted that I tossed it. Boy do I regret that now.
ale:
Two things: 1) A few of my pipes are sometimes cranky, but the rest fall into the "highly satisfactory" category at any given time. The uncooperative briars usually have some evident trait that makes them so, or they just don't like some types of pipeweed, and 2) There's quite a bit of qualitative variation within the exact same pipe, depending on type of tobacco smoked, resting period, time since last thorough cleaning, inside or outside smoke, humidity, how hurried I am etcetc.
Variation seems to me to be inherently part of the game, and absolutes based on brand are not. That's how it looks to me.