Has Javier Bardem been mentioned for his performance in No Country? Frankly I attribute that more to the Coens than Bardem. He was a horrible Bond villain in Skyfall.
Klaus Kinski in many different films, mostly by Herzog. Richard Attenborough in "10 Rillington Place" Ted Levine in "Silence of the Lambs" Erwin Leder in "Angst" C.
Based on a true story and all the more creepy for it. Claustrophobic, unsettling movie. Attenborough is fantastic in it.
MC Gainey "With a face like this, there aren't a lot of lawyers or priest roles coming my way. I've gotta face that was meant for a mug shot and that's what I've been doing for the past thirty years. If I play a cop, it's always a racist cop, or a trigger-happy cop or a crooked cop - but by and large I play cowboys, bikers, and convicts."
In the movie Hombre, with Paul Newman playing a half bred, Richard Boone plays a very bad man. The video is mediocre, but it shows Boone as a bad ass. Everybody at the stagecoach station, including even a soldier, is intimated. Everybody, of course, except Newman.
Thought of another one. David Patrick Kelly. This guy always gave me the creeps. He was especially bad (and creepy) in these three movies: The Warriors, Dreamscape, and 48 Hrs. "Warriors, Come Out To Play-ee-ay!"
Gert Fröbe as Goldfinger is still high on my list. Concerning more current movies I like Christoph Waltz as a villain and really loved Javier Bardem in No Country for Old Men. I still get the chills when I see the mystery man in Lynch's Lost Highway ("Hahaha. Give me back my phone!"). Jesus!
He was amazing in Warriors! Too good and distinctive, in fact, that I can’t accept him in other movies as the villain. I keep hearing that Warriors line locked in my head.
Aaron Eckhart in "In the Company of Men" The character he plays doesn't actually do anything illegal as such, and yet he is possibly the most horrible villain in any film I've seen.
The "worst" bad guys in my viewing history: Tim Roth as Archibald Cunningham, a wolf in fop's clothing, and his uncle, the Marquis of Montrose, played by John Hurt, putting the squeeze on the title character played by Liam Neeson.