This updates every 5 seconds.
When you enter a search term, sucks/rocks searches the web for several positive and negative phrases using that term. The score is the fraction of positive results to the sum of positive and negative results, normalized to 10.
The negative phrases are: X sucks, X is lame, X is crap, I hate X.
The positive phrases are: X rocks, X is sweet, X is awesome, I love X.