If you're British, you just won't get this. AVOID.

Rating: 1/10 (21 September 2008)

Being from the UK I'm assuming I'm missing something here. This film sounded like it had all the ingredients for a great Saturday night at the cinema but in the end I was left annoyed and feeling cheated of a night.
I came close to walking out (I still remain undefeated and never have) but a hell of a lot of other people did. To put it simply - the humour here just doesn't translate overseas.
This film was like watching Stiller and his rich friends in their living room making crap industry-insider jokes and patting each other on the back. This was barely a film at all.
I think it would be unfair for me to say the film is terrible (the fake trailers at the start are great) but the above rating really applies to my experience watching this - I'd strongly recommend any Brits to give this one a miss.
Aside from Downey Jr and his advice to 'never go full retard,' I found the jokes unfunny and the editing incomprehensible.
For some reason most of the cast seem to think that 'louder = funnier' and the more they overact the louder the laughs will be. Jack Black is really intolerable here. Too many insider jokes, too many American references that go understood and the dialogue is very hard to understand at times.
Cruises cameo does raise a smirk here and there but the ending credits are cringeworthy - the man is clearly desperate to be loved. Again, if you're a Brit, avoid this as the stateside humour is lost in translation - I did warn you.