Hi Luke
You've pretty much answered your own question. The TiVo knows little about your likes and dislikes at first so it records lots. This is why you have to give it ideas with the thumbs up and down buttons.
Of course if you do not like this feature you can turn it off in the preferences on-screen menu, but then you may miss out on it recording something you may like!
If you are worried about it chewing up hard disk space then don't. It will delete suggestions before anything else, and as the hard disk gets more full it will record less and less suggestions to the point where it will not record any if there is no room if you have not deleted any save until I delete (green dot) or marked for auto deletion (yellow dot) programs.
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