I prefer Kalmah's older screaming vocals, but I don't really "mind" the growling vocals, just need to get used to it.
The reason Kalmah's new growling vocals don't fit completely with the music is because the vocals are too brutal... Think about it, Kalmah's music is around making perfectly-harmonized and "beautiful" melodies and not making heavy brutal guitar-tuned-down music.
Listen to any Kalmah song (that is not on The Black Waltz) and compare it to: say, a Cannibal Corpse song. You can immediately see the difference in how these different artists make a fitting-contrast between the music (bass, snare drum pitch...) and the vocals (growling or screaming).
Any comments? Agreements?