Mazen, one quick look at Metacritic (which compiles all of the major music publications' reviews) show that your claim is simply not true!
HARD CANDY HAS A 65! Which would be a D on any normal test. In fact, let's look at all of the POP CDs that have higher rankings:
Coldplay:
69
David Cook (LMAO!):
67
Dido:
73
Girls Aloud (eat it):
69
The Killers:
69
Lady Gaga (disgusting):
74
Ludacris:
72
Metallica:
78
Ne-Yo (disgusting times two):
79
Pink:
69
Taylor Swift:
81
T.I.:
74
Robin Thicke:
72
T-Pain:
70
Kanye West:
73
Michelle Williams:
67
So, you know, just stop with the lies?!?1?