Roger Ebert didn't like the movie, either!
Read Ebert's review here: http://m.imdb.com/title/tt0063688/externalreviews
I was looking forward to seeing the original 'Thomas Crown Affair' because I wasn't impressed with the remake....and my b/f wanted me to see the original.
My first clue that the movie blows chunks was the theme song, that ridiculous 'Windmill' thing. I giggled even as I thought 'Oh, NO!'
I suppose in '68 the movie came off as suave, sophisticated, sexy....The split screen stuff seemed pointless. McQueen was obviously straining to appear rich & bored. Faye Dunaway looked like a mannequin as she preened & smiled enigmaticslly for the camera. I couldn't seem to notice anything other than her too-elaborate hair piece, the extra long & thick false eyelashes and the acne scars on her face.
In my opinion, 'The Thomas Crown Affair' missed on all cylinders. Thumb down.