Touhou games are really odd. They are hard,(most arcade style games are), provide some shitty graphics, yet this is the series that spawned the biggest art parody on the internet.
Yes. the biggest. There is more touhou pictures than there is any other anime or series, even vocaloid.
Touhou is actually kind of interesting because so many people have a different take on it. I prefer the non bloody mess version where every character is insane, but there is some funny stuff to find too, like manly cirno or the like.
:/ The games themselves though have almost nothing to do with the Touhou fandom as hardly anyone buys them or plays them.