I'm a little confused by your statement. Maybe it's a little unfair to handicap their acting ability based on the fact they are "Tabloid Celebrities"? How does having news about them in the tabloids make them suddenly become bad actors? They've both done some good acting.
Brad Pitt has maybe done some good acting in the past but not Tom Cruise... I can't think of a movie he's done that has been great. He's just a pretty boy that can sell films... wait, let me re-phrase... He WAS just a pretty boy that could sell films... now he's just creepy.
Some great films mentioned so far but it's got to be BACK TO THE FUTURE (Trilogy) - Are you allowed to have trilogies? Closely followed by the INDIANA JONES films and GLADIATOR and INDEPENDANCE DAY.
My Favorites change often, but more recently my top 3 are: Blue Velvet (by David Lynch) The Royal Tenenbaums (by Wes Anderson) The Big Lebowski (by Ethan and Joel Coen)
StarShip Troopers! classic, semi-take the mik Sci Fi adventure and Kung-pow because that's a pure take them mic