[Havoc]

Yeah I know what you mean.

I've started playing games at lower difficulty than would be "right" for me, so that I can get through the story.

>I've been thinking a lot about finding a genre or mechanic that would still "work"

Have a look at planetary annihilation. Plus the community mod legions. No microtx, games against AI are decent fun etc. Well worth the price without being a crazy time sink - a quick AI game is like an hour.