Critics deeply despised that era of rock. They hated especially nu-metal, metal, alternative rock, and post grunge, but that was a peak decade for it it generated some of the best music we ever seen for the genre. It got panned because it wasnāt exactly original, but neither was grunge. Grunge was also a mix of other genres before it.
Linkin Park was a groundbreaking band who produced some of the most original music. The same can about Disturbed, Korn, System of a Down, Rage Against the Machine, Drowning Pool, Static X, Rammstein, Killswitch Engaged, Deftones, etc .Chevelle was also awesome. Limp Bitzkit was unapologetically smash mouth and unforgiven. They transcended rock. Slipknot was massively popular too despite not getting much love from radio stations. Radiohead was producing some of the best music ever. Tool was doing the same thing. Manson was great in the 2000s, as well.
That era is loaded with talent and under appreciated bands like Spineshank, Diecast, Life of Agony, Art of Dying, Eyehategod, Bullet for a Valentine, Skillet, Downset, Type O Negative, In This Moment, Hatebreed, Three Day Grace, Rob Zombie, Breaking Benjamin, Mastodon, Lamb of God, Seether, Seven Dust, Mushroom Head, Fear Factory, Machine Head, Stone Sour, Nothingface, Cold, Crossfade, 10 years, Opeth, Murderdolls, Trapt, Nonpoint, Daughtery, Coal Chamber.
Even deeply hated bands like Nickelback, Staind, Creed, Puddle of Mudd, Shinedown, etc had their collection of hit songs and deep songs that rocked.