The fact that the green Ibanez TS-09 Tubescreamer was left out makes the list null and void. While it's not my fave, there have been countless artists who've had it as a must have, and there are a ton of pedals out there that use the TS-09 as the jumping off point like the Visual Sounds Jeckle and Hyde and some fulltone pedals.
If they are talking about vintage versions of the DS-1 and the Ratt, I can definitely see that. Newer versions are not as good. The Ratt, DS-1, and a Tube Screamer should be 1 - 3 based on influence. I have never played a Wampler pedal so I have no basis to say yea or nay on those two. I am a bit shocked a Big Muff is not listed unless they consider fuzz pedals a separate category.
How is it possible that the list has well-known, predictable pedals like the Rat and DS-1 but also two Wamplers?
Not that they're bad but Wampler isn't that well known or popular.