It was for me. There were great Western cartoons when I was a kid, but DBZ was so different. You had people flying around in this power fantasy, beating each other up for real. Limbs flying off, blood, death. Enemies could become friends. I suppose this made me a lot more open minded about checking out some anime my friends would tell me is great. Also Pokemon, Digimon, Medabots and Yugioh. I don't watch much anime now, maybe a few things here and there that grab me, but I definitely watched a lot more back in high school.
What anime made you interested in the genre?