I don't know if Xbox 360 users have this problem, but some PS3 developers still feel that it is necessary to display the "This game saves data automatically" prompt every time the game is booted up.
PS3 auto-save prompt
So annoying. I like to put a game in and then get up and pour myself a glass of water or make a sandwich while I wait for the mandatory corporate splash screens and loading screen. I don't want to have to pick up the controller and press a button just to get that far into the gaming experience.
It's one thing to display the message the first time the game is booted up, but not every time. Check the HDD for a game save file, and if one is present, then you know the user has already played the game and should be aware that it has an auto-save.
And if you feel that it is absolutely necessary to display such a message every time the game is booted up (because you apparently think that all the players of your game are stupid and don't know how technology works), then make it a message during the initial load screen. Don't make it a prompt that stops the game and requires the user to push an "OK" button.