I got into Guilty Gear because it was described to me as being similar to Jojo's Bizarre Adventure (everything being a music pop culture reference). I love music, so I wanted to see how many references I could spot. My first game was Guilty Gear Accent Core +R for the Vita. Straight away I knew I was going to love the series, because everything from its presentation to its characters and music were amazing. Once I realized there was a vampire on the roster, I was sold.
As for Strive specifically, I play it simply because it is the current title and has the most players playing. Its not as Metal nor as fast paced as previous titles, but its still fun for me.