I always thought John Wayne was a so-so actor. He never won an Academy Award (not that that's real indicative, but it is something worth noting). (EDIT: Oops, he did get an Oscar in True Grit - an okay film, mostly because of Kim Darby).
In particular, his last film "The Shootist" was unbelievably bad and this despite the help of BOTH Lauren Bacall and Jimmy Stewart.
Male actor faves:
Al Pacino (note how his Cuban accent gradually disappears in Scarface)
Robert DeNiro
Sidney Poitier
Montgomery Clift
Female actor faves:
Meryl Streep (stunning job on the Julia Childs flick)
Ellen Barkin (I've always had a thing for her crooked smile)
Sandra Bullock (she's got a terrific sense of humor and she's really easy on the eyes)
Mae West (if you're wondering why, you ain't been paying attention

)