"many critics have noted the weak character development, especially in its female characters[19]. Ebert despite his praise mentions "I won't go so far as to describe it as a character study" but that the film is more than the sum of its parts that may at first seem a little generic or cliched,[20] many other films such as Very Bad Things having explored the idea of a weekend in Vegas gone wrong. Critics have complained about racial stereotyping, in particular the Asian gangsters"
"An intriguing, time-hopping set-up is wasted on obnoxious characters, celebrity cameos and crass attempts at humour. "
"This is a bromance so primitive it's practically Bro-Magnon. "
"The lads duly lurch from one bewildering crisis to another. Their mission to fill in the missing blanks, and to recover the stolen groom (Justin Bartha), turns a male soul-searching tour of Las Vegas into a tedious grind. The saving grace for film fans of an Animal House persuasion is a bearded, indestructible slob called Alan (Zach Galifianakis: stick with Alan, it's a lot simpler), a John Belushi clone who asks piercing questions along the lines of “Is this the real Caesar’s Palace? Does Caesar live here?” How we howled. Well, two people did."