I actually have never heard someone say he wasn't.

Pete / Primo / RZA are the Top 3 without a doubt.

of course there are many that will sub in Dr Dre for one of those which is cool, just not my personal preference.

but if people honestly look at it;

36 Chambers
Tical
Return To 36
Only Built 4 Cuban Linx
Liquid Swords
Ironman
Forever

plus he has tons of material on Wu-related projects (Gravediggaz etc), on soundtracks (Tragedy etc), movie scores, the othe Wu albums have great material, other Wu solos that he participated in had good material.

He is easily Top 3 imo.