Yeah, SOAD get really bad press because of a lot of their fan base. But most of their ten-yr-o fan base only know like, three of their songs. They actually do some cool stuff with time signatures, and are generally pretty offbeat, too. So props to 'em.
Anthrax basically had two decent albums, but even then I find them weak compared to their contemporaries.
I hated Megadeth for ages, but I've warmed to them now a bit, because I had a mate who defended them for ages and basically pushed them on me, and now I generally quite like at least two of their albums. Haven't listened to Anthrax as much as the other three, they're the only one out of them I haven't revisited since my teens. Maybe I should, I dunno, I have Among the Living around somewhere.
Yeah, Mastodon and their sludgy/technical ilk never really get old. But same, metal isn't my most listened to style. I don't really class most grindcore as metal though, so there is that. I listen to plenty of that. I find that, on lower volumes, it actually works well when I'm studying or doing essays. mmm