I play mainy solo and sometimes in a small group.
Getting big groups of people together is tough these days with everyone having kids, dogs, cats, jobs whatever....
I have noticed that for some reason, FF refuses to incorpare special rules for low player counts to compensate for the few amount of investigators.
Eldritch Horror - One investigator is almost impossible, you get one extra clue with the revised rules but that's it. What about movement? You can't cover nearly as much ground as four gators, or two for that matter. How am i supposed to handle a portal that spawn on the other side of the map?
Mansions of Madness - Same problem as above. Getting around the map is tough with lower player counts. Enemy health is lower but if i can't get to them in time, how does that help?
AH:TCG - Maps are alot smaller so moving around the locations is not as tough solo, BUT the game is still designed around each investigator being good at something and bad at something else. Playing with two gators they can compensate each other. You loose that with solo play and nothing to compensate for it.
In Descent: Journey in the dark they have a rule that says if you are playing two players, the hero player should control two heroes and get a free action that can only be spent on attacking. Why can't we see somethng similar in the Arkham games?