As summer blockbusters go, Iron Man 2 is perfectly fine. It has some cracking dialogue, decent action and a sense of spectacle. It also contains heavy foreshadowing of the Avengers movie. Samuel L. Jackson is given more to do as Nick Fury, and a surprise cameo from a piece of Marvel iconography will have comic book fans salivating enough to overlook some of the film's more irritating flaws. It presents not one but four villains who successively threaten to neutralize Tony's nuclear ticker: The film contains relentless bloody and graphic violence -- including shootings, knifings, explosions, decapitations, torture, and implied rape -- and some rough language Up in the Air HD. The Catholic News Service classification is O -- morally offensive Up in the Air HD. The Motion Picture Association of America rating is R -- restricted Up in the Air HD. Under 17 requires accompanying parent or adult guardian. On it goes, or rather -- explodes -- to a rapid-fire, good-natured conclusion Up in the Air HD.