I like to just jump in and wing it, learn on the fly. Actually hate playing with people who expect everyone to "have done their research". Games do build on top of knowledge of previous ones, to an extent... but it's figuring out the rest what gives me a thrill.
As for complicated games, I think you forgot World of Warcraft... which I can repeat to you what I told someone who called it a game "for nerds": according to their IQ, 2% of the world population are "gifted", there are 8 billion people, WoW had slightly over 10 million players at its peak.
In an ideal world with equal opportunities for everyone, you could expect a potential audience of 160 million "nerds"... so yeah, some games are going to be more difficult that candy crush.