Smackdown's issue is that Raw operates as the top brand in Vince's eyes. I wouldn't be surprised if a few main storylines on Raw were, at some point, dreamt up over on smackdown. Put it always seems that where Raw's only constraint is the PG rating, Smackdown has a lot of politics surrounding it (Drafts, storylines, spots on PPVs, main eventers) that makes it always appear a "b" show. People like Triple H, Austin, Cena have spent very little time on smackdown (as main eventers in Cena's case) and you know these were the "top guys" since the drafts beginning. It always seems that when smackdown always ends up with several "young" talents that need building up (who then get shipped to raw straight away - Del rio, Kofi, Ziggler) and then one SECONDARY main eventer. One example is the fact that both smackdown and raw were a bit thin last year and who gets sent to smackdown? Orton. But Raw STILL ends up getting Rey Mysterio in return which kind of weakened smackdown again.