A great WR can make a decent OL look better.
And a great QB makes everyone look better!
I've said this many times, but in today's passing game the OL really takes a back seat to the QB - and even WRs, as 61 brings up.
The best offenses today have playmakers that get open quickly (thanks in part to the rules that limit defenders), and QBs that read, react and release quickly. The OL's job in pass pro is no longer to block a guy for 5 or 6 seconds like in the old days; it's to block a guy for 2-3 seconds. After about 3 seconds, if the ball's not out the play probably isn't going to work. Defenses are smart and fast today, and successful offenses need to be smarter and faster. So, you need O-linemen that can occupy blockers for a couple of seconds. Honestly, it shouldn't be all that difficult to find guys that can do that, and you don't need to use high picks on them.
Obviously, this is a somewhat simplified view of offense - but it really is the direction the sport has been heading in the past few seasons.