Choco pretty much answered it for me, Jack. I do understand what you're saying and we might end up taking a 2nd round RB because there is such depth there. However, that's what got us in trouble with Julius Jones (over Steven Jackson), and while I do understand the rational behind that move... I don't necessarily agree with it.
Like Lab said, the third best RB in this year's draft might be better than the number 1 WR. So, say there are two RB's and 2 WR's taken before we pick, then we can have the third ranked RB or the third ranked WR. This year, the third ranked RB might be rated overall higher than the number 1 rated WR... so we're getting a much, much better player if we take the third RB as opposed to the third WR.
It's just my opinion and I know there are exceptions for both ways of thinking... I like picking from positions that are deep in whatever year's draft we're talking about.