The moment they got famous in the US, they started dumbing down the music and focusing more on catchy stuff and the singer.
For me, the last truly good AE album was Wages of Sin. The next 2 or 3 albums were decent but with less exciting guitar stuff and more filler songs. Then they went downhill fast with Khaos Legions and later albums. Even more commercial sounding and looking singer, lyrics and themes were targeted more on angsty teens, zero creativity, basic riffing, recycled solos and melodies... At some point, even the basic songwriting wasn't there as different parts of the song just didn't fit together.
On top of all that, they finally properly replaced Chris Amott with Jeff Loomis, but then decided they'll just let him do the rhythm guitar and occasional short secondary solo. Just weird.
When there re-recorded the old songs in 2009 with The Root of All Evil it was funny to see that even with the same material, they just can't make something as good as their first few albums. Although that compilation wasn't as bad as IF attempt of Clayman 2020.