> Ingress on the other hand always seemed to complicated for a casual game to me.
Pokemon has a clearly defined goal which even the most casual player will easily understand: Catch all the Pokemons.
But in Ingress there is no universal goal which you _have_ to reach. It is open ended and you can do whatever you want to do. You can try to make tons of small fields, you can try to make very large fields, you can specialize in missions, ...
In order to really understand Ingress and all its different gamestyles you have to invest some time or you need a good mentor who teaches you all the basics.
Also Pokemon Go in it's current form is just a single player game in a multi player world. In contrast, Ingress is a true multi player game because there is much more player interaction due to attacking and defending portals.