Every major and most of the minor reviews I can think of have been positive or better for Madonna's Hard Candy, making it probably her best-reviewed since Ray Of Light...though I do recall Music being quite well-received, and Confessions On A Dance Floor was also considered a critical success.
This Salon piece here by James Hannaham is beautifully written, understands Madonna and truly takes the time to contextualize what she's up to:
"The underappreciated but ultimately more influential Madonna has always been the multifaceted feminist of 'Deeper and Deeper,' 'Papa Don't Preach' and especially 'Like a Prayer,' who can't control her own desires, doesn't need to control yours, and blames her parents for any faults she cares to admit ('Oh Father').
"Vulnerability makes that version of Madonna sympathetic but not weak. She exists in harmony with the one who encourages fans to verbalize their feelings and get down, sometimes simultaneously ("Express Yourself," "Into the Groove"). It's hard not to side with her when she embarrasses herself by trying to go confessional or political, gets too artsy, or reveals too much flesh ('American Life,' 'Bedtime Story,' 'Justify My Love,' 'Sex'), and it's always delightful to see her recover from gaffes that would obliterate someone else's career. Madonna's at her most compelling when even her blunders expand our view of what's possible for women."
True, and I think part of what makes a star of her magnitude, what makes any serious artist, is the willingness to do things that might be called stupid by others; you can't be great if you hesitate.