Someone says that if you reunite some old actors to make a comedy you will find with a piece of crap, a bad movie with tons of bad jokes, bad lines and lousy performances. This is not the case. If you avoid fart and sexual jokes, that's a point to count it, since almost every Hollywood comedy from the last decade just repeat that formula. This days it's hard to find in a comedy a masterpiece, and this is not one of that category, but is a pretty decent one, and is genuine funny and worth to watch.
Robert De Niro make a good old failure Hollywood B class movie producer in search of a last great movie, as those criminals the look for a great last job, and that comparison is good enough to make you laugh. His character is ridiculous enough, without exagerate the tone. Morgan Freeman make a great mafioso type of bad guy, even when his character is secondary. Tommy Lee Jones is great as an almost retired old western actor. Zach Braff is just hilarious as De Niro's character nephew's.
All in all, is not a bad movie. Is a good and decent comedy that just make you laugh and forget your problems for a while, make you have a good time. And that is more than many other comedies can do this days. It's a comedy, for Christ sake!