[quote=The Nexerus]
Ramsay Snow is the most genuinely detestable character I've seen. Some of his scenes in the TV series were hard to watch.
[/quote]

Ramsay Snow > Joffrey Baratheon. Joffrey is sadly predictable, he's low and petty, and barely clever (it's like every generation since Tywin has lost about half the cleverness of the last). 
[hider=Slightly spoiler, will probably be revealed this season anyway]The only really impressive thing he did was send the footpad after Bran with Tyrion's blade, but he still did it for petty reasons.[/hider]

Ramsay, on the other hand, is pretty unpredictable. He's shown that he can act and play the friend, and lie with impunity, as well as be sadistically evil. Everything he does is for his own pleasure, but it's not always clear what will give him pleasure. Although the show is giving him far too many scenes with sausages in them.