I haven't seen it, but all my friends agree that Battlefield Earth is the worst movie they've *ever* seen. And they're connisuers (sp?) of bad movies.
Although for video game-to-movies, I think Resident Evil (the first one) was done pretty well! Granted, it's more action than horror now, but it's still a good movie.
Tomb Raider, now *those* were bad movies...