Yeah, but thats the beauty of it. That hard, raunchy sound. I still say the Kinks were the first heavy metal ever. The Beatles, Stones, and Who paled in comparison at that time when it came to playing the hard stuff.
I agree, the Kinks planted the seed of heaviness, with a little help from the Kingsmen. The Beatles never pretended to sound heavy until the white album; the early Stones were not much more than a generic blues-rock band; and the first single of the Who, though fantastic, had a diluted garage sound (inspired by the Kinks, actually).
However, the Kinks never went far beyond that early sound, and later they got a more melodic sound, which dominated their essential albums from 1966 to 1971. I think the Who did the next step with the song "My Generation". So the tree of heaviness was initially cared by bands like the Who and the Yardbirds, later by Cream and Jimi Hendrix, and then the well known story.