I guess I may be wrong, but it still doesn't seem that rookies are making as big as a splash as previous years. Granted most of the guys you listed were not players the Pats could drafted at their positions.
Also, some of the guys you listed have not been all that impressive. Gaines Adams has 15 tackles, 1 sack, and a blocked kick. He is starting to come on, but he is ok so far. Michael Griffith has two tackles, no sacks, no PD, and no INTs. I don't think he belongs on this list at all. Jamaal Anderson has 14 tackles and a forced fumble. Again, decent rookie stats, but nothing special.
Lynch had a great opening game, but he is still only averaging 3.7 YPC. He is having a good, not particularly great rookie season. But he has nothing around him.
Gonzalez has been ok, but not a stand out. His best game is a 7 catch, 71 yard game. He is turning into a pretty good possession WR, but not looking he can start just yet. In fact, you can argue that Tony Ugoh is the better rookie on the Colts.
I will give you Willis, Beason, and Thomas. Overall, I haven't been that impressed with this rookie crop and there are few, if any, later round surprises.