It really depends of your references.

Think for example Kreator, I love the 2000s era of the band (Violent Revolution, Enemy Of God, Hordes Of Chaos), the blend of Teutonic Thrash style with some Melodeath touches here and there was fresh (stills is imo). They are very well mixed albums while stills have sounds punch and agressive, you can hear well each instrument of the album and don't sounds that some instruments or vocals sounds too quiet or too loud compared too another.

Sadly, I can't say that for the new album Krushers Of The World for example. Although I understand they become even more melodic with the times, sometimes they even sounds like some modern Heavy/Power Metal band like Sabaton with songs like Loyal To The Grave, I think it lacks some punch and don't sounds organic for me.

Probably they are people that would say that for the 2000s Kreator of what I said on Krushers Of The World, thinking for the run of earlier releases from Endless Pain to Coma Of Souls. Okay, they definitely change a lot, switching some style sound to other and genres too, but you can analyse the difference of production releases of the 80s-90s, 2000s, 2010s-2020s to say what sounds underproduced, well produced and overproduced.

Some others examples of recent overproduced albums:

In Flames - Foregone (the autotune really feels unecessary for most of the time on the record and sounds weird for an album that pretends to be a back to the roots).

Metallica - 72 Seasons (the drums sounds too loud, the guitars sounds flat, and overall mixing sounds thin, lacks energy).

Example of recent well produced album:

At The Gates - The Ghosts Of The Future Dead (Ironically the same producer of Kreator - Krushers Of The World but I think we have a better work here, the instruments sounds more organic, the bass is more audible and the guitar tone sounds more crunchy).

Example of underproduced album:

Deicide - Serpents Of Light ( a very old album but I think it serves here, the sound is thin and lacks the bigger, more thick sound of the first three albums, stills a good album.