My ratings are based on expectations for their draft position.
Brown: Performance - C, Potential - B. He has done fine. He hasn't shown all-pro potential or anything, but seems like he is doing OK now, and should be a solid starter for the future. He's doing about as well as I'd expect someone drafted in his position, but has done a good bit better than I personally expected of him (I thought we reached too much).
Molden: Performance - D+, Potential - C. I want to see a third round pick getting some playing time beyond just special teams, and I can't remember seeing anything from him yet, beyond some (good) ST play. The fact that he hasn't made it on the field yet, despite our inconsistent CB play gives me doubts about his longer-term potential (but maybe I'm just pessimistic). I really hope we see more of him now that the season is winding down.
Slaton: Performance - A+, Potential - A. This one is obvious - this would be a good performance for a first rounder, much less someone we got in the third! My concern is that over time, he'll wear down a bit from overuse.
Adibi: Performance - B, Potential - A-. He hasn't played much yet, but has done well in the times he's been in - the defense seemed to improve with his playing. I think he'll end up as a starter, and has the potential to be very good, especially for his draft position.
Okam: Performance - C+, Potential - B. Has had some playing time, and seemed to perform decently if not spectacularly - slighlty above what I'd hope for from his draft position. I think he could turn into a solid member of the DL rotation in the future, maybe even a regualar starter.
Barber: Performance - C, Potential - C. Has contributed on STs (and in regular plays, but not very well). I don't think he'll become a starter, but he should contribute as a backup, which is what I'd hope for from a 6th rounder.
Brink: Performance - D, Potential - D. Didn't make the 53 man roster (but did make the PS, avoiding an F). I haven't seen anything to make me think he has much potential, but I guess we'll see more in the future.
Overall, I think this class came out well. I've been disappointed with Molden (maybe this is the coaches' fault for not playing him enough), but surprised by Brown (I had low expectations) and especially Slaton. Most others have performed about where I had expected. Molden is the biggest ? to me as far as potential, and Adibi has shown the most flashes of potential to become a lot more than he has had the chance to show yet.