I had soju when I was in South Korea and I vowed to never have it again. I experienced the worst hangover of my life from this drink. It's very cheap in Korea so it's popular, but it's not smooth and just makes me sick. I guess Koreans have tolerance to this stuff because many people mix soju with beer before they drink it! Sake makes me sick too, but it's better than soju.
I think soju is more about the cultural experience than the taste. I had it in South Korea but I wouldn't touch it here.