In my, oh so, humble opinion, I would have to say that 3e does not explicitly diminish the importance of roleplaying. The operative word there is "explicitly".Rev. Jesse said:Is there something about 3e that diminishes the importance of role-playing? I would concede that in the core PHb and DMG that there is less advice about role-playing than there should be and that D&D is now more of a team based effort than before, but I don’t think that the current set of rules discourages role-playing any more or less than the old rules.
What 3e does do, is to place more importance on rule-playing as opposed to role-playing or even roll-playing. As mentioned by others, it stresses the rules involved more than the actual playing part.
WotC alone has published 2,000+ Feats, 160+ Prestige Classes, and 100+ classes (check their online indices). In short, they are stressing that the rules are more important than the actual game an individual plays. That focus has the vast majority of players looking more at how the different rules (and classes, PrCs, etc.) interact than anything else.
Just my opinion...