The Black Album was my introduction to Metallica and metal in general. Grunge and alternative rock had taken over the charts while I first heard it. It was like a revelation for me and maybe that's why I rate it among their 3 best.
I too was not interested in the '90s music scene at all, and I think the first time Metallica caught my attention was a video for either Fuel or Memory Remains (my memory is fuzzy). So my introduction to them was actually Reload, back around '97. Being only like 14, I couldn't really appreciate the whole album and so the singles stood out, but I loved them. So I worked my way backwards and when I hit the black album I was floored by the power of the songs - the overall tightness of not just the riffs, but of the whole band. I was drawn more toward the heavy, mid-tempo stuff like Sad But True, Wherever I May Roam, and even deeper cuts like Of Wolf and Man and God That Failed. The Unforgiven hit me hard, too. I couldn't really get into the faster tracks, though. What I noticed most was how much simpler the songs were than those on Load and Reload - it was just riffs (multi-tracked), solos, bass, and drums. The Loads were more layered because Kirk played rhythm that often differed from James's parts, and that worked - but the power couldn't compare.
I'm pretty sure I heard Puppets after that and discovered that their faster songs were
so much better in the '80s - and I have
never been a fan of thrash! I still don't care for their ultra-thrashy stuff (usually album openers like Fight Fire With Fire, closers like Damage Inc. and Dyers Eve, and most of Kill 'Em All), but Puppets was nearly perfect. I remember really liking Justice, too, but it didn't become my favorite Metallica album until years later when I got into prog stuff like Dream Theater and could really appreciate the sheer magnitude of some of those songs (by Metallica standards, of course). Harvester of Sorrow - which, ironically, is probably the simplest song from Justice - was my favorite Metallica song for a long time.
To be honest, I like the majority of what Metallica has done. Sure, St. Anger was rough, but it actually had some weirdly catchy moments. The Loads were
loaded (ugh) with filler, but had the band trimmed the fat to about 15 songs, the album(s) would have been killer. Death Magnetic was solid if a bit contrived, and I actually preferred the roughly-mixed Beyond Magnetic EP to the album proper. Hardwired was a decent return to form and easily on par with the Loads, but it still had a second disk that was mostly filler. Regardless, it had Metallica's best song in decades in Spit Out the Bone, which was like their classic thrashy songs except with
melody.