One of the appealing facets of Shakespearean villains is that they often have the best dialogue. Iago, Shylock, Richard III - although, of course, it could be debated whether those latter two are, in fact, villains - have some of the most beautiful lines ever written in the English language.
Even if Shakespeare's not quite your cup of tea, you can't deny the man had a way with words. He's generally considered to be not just the best English-speaking author to ever grace the planet, but also the greatest writer period. Whether you feel that's an exaggeration of his brilliance or not, with lines like these, it could never be said that The Bard didn't know how to string a sentence together.