RATM aren't actually rock, they merely use the framework.
Just as hip hop is not defined by studio beats or a turntable, rock is not defined by guitars, drums and bass.
Zack definitely has the best lyrics out there.
As far as 'going it alone', who does? Just because someone's name appears primarily: that means shit.
I dont even think anyone has said DMX, or anyone from Bone Thugs... lots of you are just naming underground rappers, sure lots of underground rap is good, but lots of 'mainsteam' rappers are good too. How about Dre and Snoop? And I know all Jin's Ruff Ryders stuff is shit, but his freestyle skills are crazy (and I know you're all gonna say that there are thousands of underground rappers who are twice as good as him...).
...Kobe's good too... he's sorta underground... since no one will touch his music.