Here is my personal list:
Keep in mind I have a strict rating scale, 90% of rap albums I rate 1-10 are not even close to reaching a 7.
Marshall Mathers LP - 9.0 (Cultural milestone)
The Eminem Show - 8.5 (Deep and personal, excellent flow, I wish Dre produced more songs on it though)
Relapse - 8 (I loved it. Very underrated. Excellent production and genius lyrics throughout)
Slim Shady LP - 8 (Great debut, though he would eventually mature as an artist)
Recovery - 7.5 (Great temperament, but I didn't like the production very much)
Encore - 6 (Had 5 AMAZING tracks, 5 average tracks, and 5 AWFUL tracks)