You aren't alone. I tried playing some games on maintenace day. Either the game didn't respond or a screen appeared that displayed:
*Connect to Xbox LIVE
*Continue Play Offline
On some games chosing Continue Play Offline would send me back to the Dashboard. When the screen didn't appear at all it was either black screen or return to the dashboard. There were a handful of games that did manage to work, but I couldn't get Fable II to. Mostly the games that didn't have anything to do with online were working such as Oblivion, Mass Effect, and Assassin's Creed, ect did work for me.

"Wisdom is knowing what to do next; Skill is knowing how to do it, and Virtue is doing it."
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