To be fair, some of them are in fact rubbish if we are casting the net wide enough. But AMSOIL, Redline, Driven...etc, nobody of repute has said these products are rubbish. Could they be construed as a poor value? Sure, but the same argument could be made for an oil like M1 EP if it's not being adequately utilized.
In other instances, you are paying a premium for a commodity approved additive package in a bottle that says "Redline" on it or similar, which is just re-bottled Kendall/P66. So, not rubbish, just horrifically bad value.
So, it really just comes down to: do you know what you are getting? With
@High Performance Lubricants we know what we are getting because Dave has been insanely forthcoming with sharing that information. AMSOIL didn't come out and start telling us when they started using Group III or GTL, but Dave has always been totally upfront about what base oils they use, and yeah, that piqued an interest from folks like myself who have typically been on the "use a premium approved product like Mobil 1". When Dave actually RECOMMENDED M1 0W-40, and talked about how good it was? When have we ever seen a person from an oil company talking up somebody else's product?
Furthermore, Dr. Rudnick is a world-renowned formulator with numerous patents and publications to his name, which appears on plenty of material from the likes of ExxonMobil, so it's not like you've got Miro shopping the clearance isle at Walmart and the drain tank at Jiffy Lube for components and then brewing up some unknown bucket of "magic" in an unmarked warehouse in some sketchy abandoned industrial district.