Better than average plot but not enough to raise it above B-level.
I think Meg Ryan's star status worked against her because her cute reputation undercut her tough character. However, she proves that she can do something besides "bubbly" and is pretty good in a more edgy role.
Tchéky Karyo was excellent as a semi-likable French guy. One common weakness in romantic comedies is that the viewer can't understand why the "nice girl" would fall in love with the "bad guy." In this movie, we can she why she loves him and, by the end, we even like him a little too. Good writing and acting.
Not Matthew Broaderick's best performance... fairly uneven. He doesn't do "hopelessly in love" very well. Broaderick looked great, even when disheveled. For that matter, all the characters look great.
Kelly Preston is pure cardboard but it sort of works because three developed characters are probably enough in a Romantic Comedy.
The set (the hideout, especially) stole the show. The sound was unusually good for a fluff movie.