I read a couple of his books some time ago, and they were informative, though redundant. He focuses on cash flow, specifically, having investments that generate cash flow. For instance, although you can make a lot of money on your home (depending on where you live, I guess), he says it is NOT an investment, because no cash comes from it. He focuses a lot on rental real estate, as well as owning a business of your own as opposed to just being an employee someplace.
IIRC, the game is actually intended to be educational. Parents who have decided to run their finances as the author suggests buy the game so they can teach the concepts to their kids (and friends?), and get them excited about one day being property owners or business owners.
Cultish? I guess I could see that. I suspect that the people who want their kids (or friends) to play this feel very strongly that their kids (friends) should take a clue from the game and become a property or business owner. The game was sort of introduced to me that way, though I never played it.