Re: celebrities-movies always flopping??
I know a lot of actors who would give their left arm to direct a flop like Good Night, Good Luck, or act in Syriana.
Or to act in The Assassination of Jessie James By the Coward Robert Ford or Babel.
Or The Interpretor or Cold Mountain.
Of Carrey's last five movies, three (Fun With Dick And Jane, Lemony Snickets and Bruce Almighty) grossed for more than 100 million. One of the others - Eternal Sunshine For The Spotless Mind - was a critics darling.
For every bit of fluff like an Ocean's 13 or Mr. And Mrs. Smith, you will also notice actors taking on more responsible and acclaimed rolls such as Babel and Dogville. Fluff usually makes more money - but any respectable actor knows a hardcore roll will garner them a chance to work on those fluffy money machines - and some actors gain more satisfaction in rolls such as Micheal Clayton.
Of course, some will find themselves in the perfect marriage of both, a la Fight Club, O Brother Where Art Thou?, The Others, Snatch or The Truman Show - but those instances are rare.