Bill Barnwell of Grantland looked very closely at Jake Locker through the first three weeks of the season.
This piece includes several GIFs that show both strengths and weaknesses for the third-year quarterback. I think it's a fair measurement of where Locker currently stands.
As Barnwell points out, we'd be far more interested in the deep miss for Damian Williams if defensive back Marcus Gilchrist held on to what could have been an interception -- though he fails, in my estimation, to sufficiently point out it would have been on Delanie Walker as it hit off his hands.
There is a lot of good stuff to look at here, and it's a good read.
I saw more functional accuracy on shorter throws than I was expecting; Locker still misses the occasional easy pass, but so does just about every quarterback. I don't think his zero interception rate means much of anything, since we saw how lucky he was to avoid one and there has been little change in any of his other rate statistics. What I'll be watching for is that final step Locker has to make to go from being a promising quarterback to a prosperous one. He needs to stop being the guy who can make all the throws and become the guy who does make all of them.