Both declined on BR&L & TLM (Phife was especially cringeworthy.) Q-Tip's flow was choppy & sloppy for years until he improved on his comeback album.

Posdnuos - stiff & sounds like he's reading off paper.

Cosign on OC, Ras Kass, etc. (OC is the worst live performer ever, btw.)

Method Man, but I think it's mostly because he's somewhat incapable of sounding good on a non-RZA beat.

I'd say Kweli, but he's always had cringeworthy moments.