...but (spoilers) neither likes it much:
"Paired with another scruffy American in Paris, Julie Delpy actively engages viewer recollections of Before Sunset in her DIY feature-length directorial debut. Playing like a rough-around-the edges reinterpretation of Richard Linklater's transcendent Before Sunrise sequel, 2 Days in Paris echoes Sunset in so many ways it's nearly impossible to meet on its own terms (at least for one as admittedly infatuated with its predecessor as I am). Much of the film's meaning seems generated by comparisons. His name this time is Jack (Adam Goldberg) rather than Jesse but, as Marion quibbles with her beau along the Seine--full of resting riverboats--we can't help but think back to Celine and Jesse's tremulous ride. Delpy's character in 2 Days also distractingly resembles the other in intellectual curiosity, strident political concerns, and unabashed love for her cat (named Jean-Luc, though we still remember Che). Is she intentionally playing off these resonances, and to what effect?"
"The unanimous acclaim for Richard Linklater’s Before Sunset, certainly high on the list of this decade’s small handful of American masterpieces, will engender a fair amount of good will towards Julie Delpy’s 2 Days in Paris. And not merely by association with that fine earlier film—Delpy was that film’s anchor, and so naturally and effortlessly did her indelible character Cèline’s world views, philosophies, agonies, contradictions, and neuroses float off the screen that it left little doubt that we were watching an approximation of the actress herself. The fact that she cowrote the screenplay with Linklater and leading man Ethan Hawke only compounds the nagging verisimilitude of the character—as does Before Sunset’s real-time shooting style, which heightens the film’s near documentary feel....2 Days in Paris goes a long way toward exposing the challenge of trying to separate Delpy from Cèline as a fruitless one.