New Jack, I hate, old Jack I love. He is best in Cuckoo's Nest, The Shining, Chinatown, Batman, and Five Easy Pieces. I even prefer his Joker to Heath's in certain aspects. Well, all aspects I suppose. And I do admire Heath's Joker. But ultimately the two Jokers are different characters, but let us not get into that.
It must just be me because he is on a bunch of these lists but I really don't care for Jack Nicholson. Maybe I haven't seen the right movie.