Top 3 in my recollection basing it on where they were picked, and who they were picked over:
1 - Greg Robinson, OT - 2nd overall. A huge bust. Didn't catch on with anyone, though others tried because of his raw tools. A disgusting group of good players were taken after him including our HOF Donald. 5-K.Mack, 6-J.Matthews, 7-M.Evans, 11-Lewan, 12-OBJ, 13-AD, 16-Z.Martin, etc ect. The list goes on. A really great first round and we pick the worst one in it when we had the entire class outside of Clowney to choose from. Yuck.
2 - Tavon Austin - 2013 8th overall (after we traded up to get him). This one still haunts me. We actually gave up some serious capital to move up and take him. At the draft spot we had previously, we could have taken likely HOF DeAndre Hopkins. And still had him. Hell, Cordarrelle Patterson is balling now even, and picked after both. This wasn't a crazy amazing draft but, if we were determined to get a WR in this class, we should have stuck to our position and taken the far more talented one.
3 - Jason Smith, OT - Just a useless player. Never materialized into even an average OL. The only saving grace is 2009 was a pretty bad draft overall. Stafford was the pick before (man would that have been much better), outside of that, the next truly outstanding draft pick was maybe Alex Mack at pick 21, followed by Clay Matthews at 26. Really a underperforming class as a whole.
Honorable Mention
-Sam Bradford, QB - 1st Overall 2010. Was he the least talented pick? No. Did he live up to his abilities, definitely not.
-Tye Hill, CB - Flashed amazing talent at the senior bowl and crazy athleticism, but was awful for us. Some pretty nice players went after him too.
-Lawrence Phillips - Was pretty close to the top 3 and probably should just be 3b. Pretty disgusting career and human. He was taken ahead of Eddie George BTW. And we got rid of Bettis to get him. Actually, maybe he's the worst afterall.