I hesitate to even engage here, but 1) your experience is seemingly entirely based off your time with homemade, self-professed “redneck” bucket subs, which c’mon, 2) whatever the KC62 marketing, there are genuine innovations in motor design, cabinet (alloy), DSP, and surrounds — none of this stuff is off the shelf, 3) advertising a sub’s +/-3db frequency response without any mention of the SPL is perfectly common, everyone is getting hung up on the 11hz thing like they’ve never seen specs communicated like this before, 4) if your advice is that people should really look at three small subwoofers instead of the KC62, then clearly you don’t understand who this product is targeted at, and 5)
we have Joe N Tell’s in-room measurements of the KC62 and SVS 3000 Micro and it’s clear they both have their appeal, and it shows that KEF has accomplished something (not everything!) considering the size. “Considering the size” has always been the operative words.
Making the comparison to the SVS, if you want SPL in the 105db range, but you’re ok with that starting around 35hz and higher, then go for the Micro. If you want the maximum frequency response range, i.e. the famed 11hz figure, but you’re ok to that being limited to 90db at the lowest lows, the KEF delivers that in a way that the Micro simply can’t and in a way the skeptics said was simply impossible. The KC62 provides up to 18db more there than the 3000 Micro. Lastly, the equalizing factor, if you’re going to room-correct with typical curve at 20hz anyway, then neither sub is getting you more than 95db, so they’re functionally the same with different strengths (the KC62 isn’t dropping like a rock lower than 20hz, and the SVS has more headroom from 25-65hz).
And speaking of marketing fluff, SVS says the 3000 Micro is -3db down at 23hz, but Joe N Tell shows it’s down more like -10db. I don’t personally care, they all have their compromises. It’s up to us to make educated choices.