I won't do all your research for you, but you can check this out:
http://espn.go.com/blog/afceast/post/_/id/...atch-percentage
Also, you can crunch some of the numbers here to see the yearly percentages:
http://www.advancednflstats.com/
According to that site, Reed ranked #2 in the NFL in catch percentage at 72.3% and has regularly been over, or near 60%.
Now, these stats don't tell the whole story, and it would be interesting to see the real criteria for what constitutes a missed opportunity. And, to answer your question, the value of a WR in the NFL is more complicated than looking at their catching ability. Reed is a small WR with below average speed. He also runs great routes and is a punishing blocker.
But, let's get back to the point. Calling a guy who catches the ball as well as Reed "drops" simply doesn't make sense.