Dawdling preciousness aside, the cheeky self-reflexivity and knowing artifice — Hugh Grant looking at Julia Roberts' breasts under the sheet, to cite an example — go a long way. Not to mention Roberts' willingness to play such a petulant, capricious incarnation of herself. The "Ain't No Sunshine" and "How Can You Mend a Broken Heart?" montages, while easy, are strong and clever enough to almost make me forgive the use of Ronan Keating's monumentally awful "When You Say Nothing at All" cover. Almost.
(If you're wondering, the superior rendition of the song is the second version: Alison Krauss' gorgeous '95 cut. Keith Whitley recorded the original in 1988 and it also sucks. If I didn't internalize such mind-bogglingly useless information, I probably wouldn't be writing reviews on this website.)