If you really really want to see him break out of his nice guy protector role you need to watch him in Die Hard2. He played the main bad guy and was very very very good at it! He also played a very sleazy bad guy in a late 80's Steven Segal movie....I think it was called Hard to Kill.
But....if you really want to get into a debate

.....watch him and his character on Star Trek Deep Space9. Depending on who you ask in that fandom he either plays a bad guy who was brought in to destroy everything that Star Trek stands for....OR....he was an awesome character who saved everything Star Trek stood for by going behind the scenes doing all the bad things to protect all the 'good' people in the Star Trek universe who was too noble to do said bad things. I supported his character one hundred and fifty percent!