I believe there's a general consensus that Harlan is a swine.
Oh, completely. He's brilliant but nasty, and -- most damning -- enjoys being nasty. I was subjected to him at one work gathering, and have refused to willingly be in his vicinity since then. I didn't find him amusing or entertaining or anything other than mean.
However, I also know people who have benefitted from his kind and generous side. It's a pity he doesn't let that out to play more often.