The phrase "Ballsy" comes to mind

Rating: 8/10 (30 October 2008)

For a film that's been bankrolled by Dreamworks(Spielberg,Katzenberg and Co.),this is about as sharp,incisive and unmericful a satire as you're gonna get from the film industry ABOUT the film industry.
The whole product,to me,is really not as good as the parts,and the film actually seems to be a little TOO self-aware,which makes the comedy somewhat rough. But the riffing on film clichés and conventions,as well as the union of four Showbiz archetypes:the action her(Ben Stiller,also directing)who wants dearly and desperately to be taken seriously,the Award-winning Australian bad boy actor(Robert Downey Jr.,who,depending on your tolerance fro big bold character,will either be doing his most impressive or most annoying performance of his career here)whose form of "mehtod" acting has now crossed into racist territory;the comedic actor(Jack Black,mocking his work or his peers?You be the judge)whose unbridled success has fed his worst demons to the point of implosion;the rap star(Brandon Jackson,maybe the coolest acting here),an ambitious kid with plenty of his product to hock and an image to protect;and the low-end,up-and-coming actor(Jay Bauschel),who clearly understands the craft,script,subject material(etc.)MUCH better than his much higher paid co-stars. They go off course of the Vietnam movie they're cast in and end up being the prey of Vietnamese Meth runners.
Caught in this net are a juicy(and possibly most interesting)assortment of side characters featuring: a back-slapping Charlie of an agent(MAtthew McConaughey,does he EVER act?) for Stiller's action hero,the crippled lone survivor Vietnam Vet(Nick NOlte)who wrote the book and provides script material,the jacked-up Demolitons expert(Danny McBride,almost picking up where he left off in Pineapple Express)who almost worship's Nolte's character,the harried Brit director(Steve Coogan)who probably has no business directing this project and a callous Mo-Fo of a Studio exec(Tom Cruise,receiving no billing at all and darn near stealing this show!)who regards his stars and filmmakers the way many people regard toilet paper.
As alluded to before,this is hardly a perfect movie,but it does have plenty of memorable lines and a savagery of the film industry that it so richly deserves. The unmitigated chutzpah of this film(it seems to have utter contempt for practically ALL of its characters)makes this alone worth catching. Worth a look,though one better know EXACTLY what they're getting into before seeing it,big screen or small.