I wasn't expecting much from this film, but was very pleasantly surprised. The format is extremely clever, and I can't immediately think of another film which is primarily a comedy but also has such exciting action scenes, a lot of which are more gripping than some dedicated thrillers.
Steve Carell is excellent as usual, and makes a believable spy, the twist being that he good one who lacks the confidence of his colleagues. Dwayne Johnson was a surprise comedy success in Be Cool, in fact his performance was the best thing in it, and he's brilliant here too, he may be one of the best "crossover" talents out there. Alan Arkin and James Caan also deliver some memorably funny lines, although Terence Stamp disappoints; he behaves as though he's making a commercial. Anne Hathaway plays her part as Carell's sparring partner and love interest admirably too.
The blu-ray presentation is also successful, great detail and colours, and the sound is punchy with an nicely enveloping soundtrack. Very impressive all round.