Reminders just pop up on your xbox. As soon as you set a reminder, you'll start downloading the game, too.
I agree that most people will never be the One or the Mob. The top 3 crowd members win prizes, but that's also very hard to ever do. Everyone earns sweepstakes entries, though, so there's always a chance of winning something.
Regardless, the hope is that you still have fun playing from the Crowd. You can still participate in the shared community experience and enjoy Chris Cashman's witty banter. If you like watching game shows on TV, I would expect you would enjoy being in the Crowd in this game too. I think it's a little cooler than that, because you can still send in email to the live host and possibly get him to read your "shout out" on the air. They look for something particularly funny or interesting, so be creative if you try it.
Questions are easy beacuse it's a casual game. Also, if the One gets it wrong, then it takes a while to select the next group of contestants, which means you get to play less.
I'm not sure about Silver accounts. I know you can join as a Guest, so you can have 3 people over and play along on their own controllers. I would guess that Silver would work too. Guests and Silver are not elligible to be the One or Mob, and can never win any prizes of any kind.
If you don't enjoy listening to those 2 talkative black kids, you can mute players. So far I've never seen anyone use their headset, so that's kinda cool.

Thanks for trying it out. I don't think you're the true target market, since you can't stab, headshot, or teabag anyone. But so far it seems to be going over great with people of all types. Frequently people say this is a game they can get their girlfriend/wife to play.