If you see FWWM before seeing the TV show like I did, it works 'wrong' in that it's a complete WTF. Something you wouldn't get if you know the show, although it does kinda spoil the mystery so it's a trade-off. At the time I watched it I only went ahead because I thought I'd never bother watching the series, but the news of a 3rd season got me interested.
It was a guy at work who recommended it to me as a complete WTF, so I don't think he'd seen the show either. Well, he's old enough that maybe he saw some episodes at the time, but he doesn't seem like the sort of guy who's studious enough to make sure he tunes into every episode of a series.