Part of the appeal with Kendrick for me is his voiceDrake is definitely a great rapper, listen from Room For Improvement all the way till now, started off as a Phonte/Joe Budden hybrid rhyming over really smooth R&B type production evolutioned and experimented and has been at the top of the game for a few years now. He's got the classic mixtape So Far Gone, he's got the classic album in Take Care and he's been apart of some many records that will go on to shape this generation for better or worse depends on what you think of this generation. I think he makes good music and just has a dope ear for melodies, hooks and beats and he's proven especially on his early material that he can rap his ass off.
Kendrick Lamar is a great rapper. Lyrics, flow, content, beat selection he has it, his voice isn't the greatest but the man's catalog is full of very good music. All of his official projects really are worthy of critical acclaim, he's is a great conceptual artist and the best storyteller in the game right now.
I feel like those two guys are great everyone else is just good, I take it you consider this generation to be guys who came out in '09 when the Drake, Cole, Kendrick, Cudi, Odd Future, etc. all started popping to now.
Especially when he does the changes.