That it all-around sucks? That I've been telling people this since it's creation? That nobody fucking listens to me? Or that this preview picture looks like ET and Titanic had a mash-up. Or all of the above.
Seriously. I'm not at all an art guy so I feel qualified to observe that The Scream is probably one of the top 5 (and definitely top 10) most well known paintings, somewhere shortly after Da Vinci's Mona Lisa and Van Gogh's Starry Night.