'Maid in Manhattan' received generally terrible reviews, and understandably so; this is no cinematic treasure. Critics were right to call the movie clichéd, contrived, and predictable. Jennifer Lopez and Ralph Fiennes lack chemistry; and (while not the brattiest I've ever seen) naturally Lopez's character's young son comes off as a little too "cute" and overly precocious.
All of this being said -- I didn't think 'Maid in Manhattan' was THAT bad of a movie. I didn't LOVE it (by any stretch) but I didn't think it was any worse than -- or much different from -- most other romantic comedies of this day and age. (Including many "rom-coms" that received far better reviews.)
Lopez neither charmed nor irritated me (much) as the title character; I rolled my eyes a few times, but for the most part, she was just kind of... meh. As for Fiennes (her character's politician love interest/Prince Charming), for what little personality his character displayed, I... sort of liked him.
I'm probably being a little too generous by giving this one two-and-a-half stars (5/10) -- but for its genre, 'Maid in Manhattan' is fine. Not wonderful by any means, but it passes the time; and I've definitely seen movies that are far worse.