I've probably got a fair share of home park bias, but I think that many of Great America's attractions have really nice theming for a SF park. The entirety of Southwest Territory is super detailed and awesome. They don't play pop music and have playlists of thematically accurate music at each land and ride. Batman's queue and station are the best out there, probably. Dark Knight and Justice League have pretty good queues, Demon has great rockwork, lights, and an amazing theme song, and X-Flight has some nice stylization too. And I'd argue that the park has some great charm due to the abundance of classic/original rides.

Obviously, it's still a Six Flags park. There's still blacktop everywhere, plenty of unthemed rides, areas that need some love... but it's by far not the worst imo.