Favorite acting people, because I don't feel the need to split them up by gender:
Johnny Depp: I love his versatility and his style.
Charlize Theron: Her performance in Monster was incredible.
Marilyn Monroe: Must I even explain?
Bill Cosby: Classic and eloquent comedic talent. Both highly sophisticated and very silly.
Eliza Dushku: A balance of raw sexuality, outstanding attitude, and actual acting ability.
Al Pacino: A very experienced and talented actor. I loved him in The Devil's Advocate.
Halle Berry: An outstanding actess. I love her in her less popular films like Introducing Dorothy Dandridge.
I'm very sorry, but I give precious little credit to film actors and actresses. Most of the quality in modern film (which you'll be hard pressed to find anyway) stem from the writing and direction.