Log on once every 24 hours to basically renew your certificate. If I log in at 3PM Tuesday, I can play games until 3PM Wednesday. IF they kick you off from playing games, that's ****ty. But if they let you play until you quit, and then deny access to your games, it's still ****ty, but it allows you to have offline gaming.
If you want to play your game at a friend's house, log onto your account on their Xbox. Basically, a mobile game library.
"...and any one of your family members can be playing from your shared library at a given time" is the only one that caused any confusion, and I just don't know if you are limited to one family member or how they deal with playing the same game (ie, could I play Halo with my cousin who signed in on my account?).

But seriously, I've been expressing my concerns too. I hope that they do it justice. I can't honestly think of any sequels that Will Ferrell has done so far to compare to. So, hopefully it will be well done. My biggest fear is that they'll try TOO hard to copy their "formula for getting laughs."

Also, in regards to your graph, I saw Jack and Jill on TV the other day. It deserves a separate row for the awfulness. It was like watching a car wreck. It's so horrible that you just can't look away.