What you want to hear: "great theme" -- which is true, it has *great* theme integration. The game puts a smile on my face every time.
What you may forget to consider, but it's true:
-- Name another pin that is 'safer' to play (in terms of layout). You can't. The only consistent danger on this pin is making a great center shot... (doh)
You don't need to know the rules to have fun playing AFM -- all shots are beneficial -- you can flail away without ever looking up at the upper playfield -- most shots return the ball safely to the flippers...
AFM is the *safest* fan layout of all time. There's nothing at all wrong with liking safe or easy. Just be honest about it, next time you are bashing a game for being "too easy"... remember your love of AFM... It is partially due to how relaxing it is to play an easy game.