The 00s anime style was atrocious and I don't care who hears it. The kind typified by Kanon, Clannad, Love Hina, Haruhi, etc. Everyone looked bug-eyed, their faces looked like they were melting. It's just gross and unappealing. The flat, light colors style of the 10s was probably a course correction, although we're probably too soon into the 20s to see how that goes.

The 90s style is still beautiful. Sharp lines, deep colors, characters who actually looked like adults too. I loved how deep the shadows were too. Anime gradually lost facial shading and it's a damn shame.

Also no one in anime has a nose anymore. It's gone from a nose, to a dot, to nothing.