This list was comprised by Metacritic, which takes the critics reviews, compiles them, and "adds" the scores together. Pretty interesting list. If you check the link there is more of a breakdown as well as highest reviewed albums by genre.
For Indie/Alternative
1 Sleater-Kinney
2 Spoon
3 TV On The Radio
4 White Stripes
5 Sufjan Stevens
6 Animal Collective
7 Drive-By Truckers
8 Lightning Bolt
9 Sigur Rós
10 Bjork
Hip-Hop
1 OutKast
2 Dizzee Rascal
3 Kanye West 81.8 College Dropout
Yo Kanye, we’re really happy for you, but OutKast had one of the best decades of all time.
4 Missy Elliott
5 The Roots
6 Murs
7 The Streets
8 Nas
9 Ghostface Killah
10 De La Soul
Pop/R&B
1 Solomon Burke
Not bad for a man whose age is close to his average Metascore
2 Me’Shell NdegéOcello
Her stellar December ‘09 release is not included, since it had just 4 reviews at press time
3 Erykah Badu
4 Al Green
5 Mary J Blige
6 Norah Jones
Come Away With Me trailed only The Beatles and ‘N Sync for top-selling album of the decade
7 Shakira
8 Ne-Yo
9 Alicia Keys
10 Keyshia Cole
Singer-Songwriter
1 Bob Dylan
2 Tom Waits
3 Sufjan Stevens
4 Iron & Wine
5 Sam Phillips
6 Richard Hawley
A former member of Pulp, Hawley is one of the top British singer-songwriters working today
7 Andrew Bird
8 Neko Case
9 Richard Thompson
10 Rosanne Cash
http://features.metacritic.com/featu...of-the-decade/