For one, Roth-era Van Halen is enjoying a revival the last several years. I'm not saying the current product is good or isn't, I wouldn't know, but I'd say pretty comfortably that their legacy is more than fine. If anything it's the legacy of the Hagar-era VH that withered up and blew away.
Based on the other selections, it kind of reads like "old bands you wish got more credit than they do". Ok, I'll try. I don't know if I can come up with 5 off the top of my head...here's some that use distorted guitars (remember those?)...
The Melvins. Lost in the Seattle shuffle, and not as ambitious as the others, but they have some brilliant sludgy weird tunes that eschew the bullshit that currently pollutes rock and roll. You know, the extremes of - boring bluesy bullshit as if it were still 1968 or boring poppy bullshit that is so unchallenging it might as well be played by boy bands.
Max Cavalera-era Sepultura - yeah, they are fairly legendary in thrash metal circles but that shit (albums Beneath The Remains, Arise) stacks up just as well today as it ever did. Amazing how it has aged so well. Though great music that hints at being expertly progressive always will. The Brazilian Metallica - without the embarrassment of the Black Album to weigh down their legacy. Though, they did creep into almost nu-metal territory with Roots but that album is one of the most brutal and yet still highly musical albums ever committed to record. They continued without Max but fuck the later shit.
Deftones - unfortunately written off as part of that whole shit show of nu-metal crap. Their earliest records were more in that vein and naturally are the least of their work but they have consistently made good melodic, dark, beautiful and abrasive music since. That is, if you aren't one of the dullards fooled into believing hard guitar has to mean it doesn't have any emotional sensitivity or depth of intellect.
Helmet (original lineup). More recently the jazz wunderkind Page Hamilton has done his best to muddy the waters enough that you'd be forgiven for maybe thinking it was always a shit band. But they used to have some great albums - In The Meantime and Betty - are fucking great demonstrations in hardcore riff assault. And that backbeat of Bogdan and Stanier, wow...that original band was so tight it was ridiculous (listen to the bridge in Turned Out). I suspect their legacy, these days, is likely written off as a seemingly obscure 90's band that was merely a precursor to nu-metal (stupidly simplified version of events). I just wish some 18 year old kid in their room playing guitar and wanting to form a band thought to themselves- what if it had a groove like that - somehow cleanly noisy and really hooky as fucking fuck - and just tight enough to be human and not machine-like - but added more melody and actual singing over the top...that would be something I'd really like to hear.