I think it's aging better than SA1, though that's not saying much. Doing my mega-playthrough on 6/23, SA was the only game that felt like an absolute grind. With that said, this reminds me of a discussion a friend and I had several years ago. We were debating whether Sonic 3 & Knuckles or the SA series were better games. He kept bringing up all the memorable moments in the SA series; running down the building, running from the whale, getting caught in the tornado, flying on the rocket. And it reminded me of how, around S3's release, the magazines were all treating it like some impressive technical marvel that Sonic was able to run up the inside of the tree trunk in Angel Island. But that's the last thing the game is remembered for today. The SA games were phenomenal for their time, but they relied more on spectacle than gameplay. As time goes on and those spectacles become less impressive, the games lose more and more of their shine. It's a common problem for earlier 3D titles.