So you pass on a WR who is being compared to Fitzgerald (Crabtree), a WR who is very fast and ranked #2 on everyone's boards (Maclin)... for the #4 ranked WR, projected late first round between 25-30 because he ran a 4.3? And BTW not sure where you saw the 4.25 but the published reports I have seen list 4.3...
If Oakland picks Bey at pick 27 then that is fine. But to pick him at 7, especially when both Crabtree and Maclin were out there, is a complete joke. Rumor is that Crabtree snubbed Oakland, pulling an Elway/Eli hissy fit... so maybe that explains why no Crabtree. But you still had Maclin.
And also, I could care less if you run a 4.25 if you are getting pressed at the line by the CB and your route is prevented. I guess you are in the minority on being happy with this pick