Peter Criss might have been the cat, but Ace had nine lives. Seventy-four is too young to go, but he could have checked out much earlier and on multiple occasions.
Despite the makeup and stage presence, he wasn't a flashy musician, but the showmanship and theatricality of his solos from KISS's heyday remain unmatched. His style fit those songs perfectly and is a large part of what makes them so memorable. I wasn’t the biggest KISS fan but as a hack guitarist, I found their stuff like Parasite or Detroit Rock City very enjoyable to learn and play (it just sounds good and fun).
He definitely had his issues which, as noted above, he was very open about, and some nights (especially during the reunion era) you didn’t know what you were going to get and, brother, it might be baaaaaad. At his worst, you pretty much knew what you were going to get but still held out hope it’d be otherwise.
I saw him earlier this year and I’m very glad I did. He was…fine. That’s all he had to be though because he knew he was Ace Frehley and we were just happy to see him and we knew he was Ace Frehley and he was just happy to be there. He carried himself like a total rockstar but one who’d seen and done it all. It was impossible to tell if he was impaired and maintaining or if he was flying high on Plavix and Poland Spring that’s just how Ace is after decades of The Life.
Rock soldiers come and rock soldiers go, but that dude was on the front lines of a revolution.