There are the Allmusic reviews, but I don't think they're quite as indepth as like Pitchfork. I'll look around for some professional reviews, because I swear I've read some, but it's been a while since I've actively searched. They do also have the making of videos for albums that they do on bonus discs, but it takes a while for those to get translated, if they ever get translated at all.
This article has a lot of Kaoru and Die's personal influences, and you can hear a lot of it in their styles: https://rateyourmusic.com/list/vinidamazio/dir-en-grey-guitar-roots-album/
There's another magazine interview somewhere from a few years ago with Kyo and Die and maybe Kaoru, but I can't find it now, where they list their top albums. Kyo was also very influenced by punk bands like The Stalin and Kaoru was influenced at one point by nu-metal like Limp Bizkit. Their Kisou-six Ugly-Vulgar-WtD period has a lot of riffs that wouldn't sound out of place on Limp Bizkit's Significant Other.
I used Japan Discoveries once before, spent maybe £20 and had no problems. Then months later I spent £130 on Dir en grey stuff. Weeks later they hadn't posted my order, so I sent loads of emails, sent messages on social media, even tried to call them (just ended up being just a answering machine). But they never answered me once after a few weeks of messaging. So In the end I had to get a refund from them through Paypal. I'd never order from them again after all that 😒
check if the jrock_scans and community still exist on LiveJournal. they had the best archive of dir en grey scans. I went ahead and got the links for you: http://jscans.baka-koneko.com/ and https://www.livejournal.com/tools/memories.bml?user=direngrey_fotos&keyword=Haiiro%20no%20Ginka&filter=all