Very few caper films can reach the level of sophisticated intelligence that The Thomas Crown practically oozes in every scene. The movie is clever, witty, and features strong performances from Brosnan (as the titular thief) and Russo (as the cynical woman simultaneously trying to love and apprehend Crown). The two main actor's chemistry is great. The plot takes its time, to be sure, but is never uninteresting (and is, for the most part, exciting and involving).
There is much to like about this film. It has a gritty edge to it, doesn't fall for an easy happy ending and features Sinatra in a solid final starring role. But it also struggles to make its villain very interesting and it saddles Faye Dunaway with a role she can do very little with. Still worth seeing for Frank Sinatra and some good supporting performances.