OK so I've read a few reviews and I can only surmise that I was watching a different film to many of the reviewers on here.

I fell asleep, it was that dull. Stiller should really take an ego check and take some pointers from his character (talk about irony). Black was just being Black (but on an off day). Downey Jr needs to get back into the Iron suit, he was just irritating. On the other hand I found Cruise amusing and definitely able to take the rise out of himself.

To be fair though I think the idea was a good one, but it was executed badly. It wasn't satire, it was just Stiller trying to get his career up and running again, I've never been a big fan, and nothing has changed.