What Happens in Vegas takes the "thin line between love and hate" approach to the romantic comedy. It's a time honored tradition: the characters begin as antagonists but end up madly in love. Along the way, sparks fly. In this case, director Tom Vaughan starts his protagonists out as if they're in The War of the Roses but concludes with them in the grip of emotions that make it impossible to live without one another. The film's misstep - and it is a significant one - is to take too long to tone down the broad, cartoonish portrayals of the leads into something resembling human beings. As a result, the first half of What Happens in Vegas plays like shrill sit-com material.
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