One thing about Marvel and DC that we kind of have to scratch our heads at is that the mundane world lives largely in stasis separate from all the superhero action. The main point is the term "Reed Richards is Useless", where he (nor any other super genius) doesn't change the world in any meaningful way outside of superheroics. Granted, this isn't a bad thing, for a variety of reasons. The main one being that superheroes work best as part of a fantasy that this could be our world.
Plus, with the shared universe aspect, they basically have to keep the mundane world the same for everyone to be on the same page. It'd be a nightmare if one issue of the Fantastic Four has Reed patent flying cars, then everyone else has to adjust their titles to fit. They have a hard enough time keeping pace as it is.
But what I do like in other superhero worlds is where the world looks like ours, but there's just enough of an effect on society where it's cool to see. How much of that is in City of Titans?
As some examples:
- The crimefighter license, and superhuman law in general, showing just how the laws have adapted to the world they inhabit.
- People who aren't superheroes or supervillains that have powers and abilities, such as Elmer Haws being an attorney who happens to have super strength.
- The COP suits that the police have, essentially low-level power armor that enables them to deal with tough customers outside the normal range.
- There is an intelligent dinosaur population in Titan City, including one who drives a cab.
- The TCFD has a member who can put out fires psychically, making him very useful.
- Downtown is a "vertical city" with connected buildings and airship traffic rebuilt after Hurricane Atlas.
Anything else to note? It's pretty cool to see worldbuilding like this.