Someone will be hard pressed to knock Kendrick outta that #1 spot for me. Krit's Return, Phonte's Charity, Cole World, Wale's 11.1.11, Beastie Boys' Hot Sauce, Elzhi's Elmatic, Game's Red, WTT, Rae's Shaolin, XV's Zero Heroes, CyHi's Royal Flush, Pac Div's Mania, Curren$y's Covert Coup, Stalley's Lincoln Way, Maybach's Self Made have all stayed in heavy rotation.
Hopefully Take Care and Ambition are added to that list. All in all I feel like 2011's first three quarters have been pretty solid for hip-hop. Not so much commercially, but as far as the entire genre is concerned.