>>149320597
Omniverse arguably has the most focus on aliens and sci-fi concepts than any other series. And this is without completely abandoning things like magic like Alien Force tried to do before they backpedaled on that.
We actually pretty regularly go to alien worlds and there's a whole arc for the Halloween Aliens. They introduce the concept of aliens having their own natural predators, fleshing them out a little more in the process.

Ultimately each series has their own flaws, Classic included, and you just have to come to terms with that to enjoy what good stuff there is if you plan on watching them.