Another thing to consider -- and which Patler alluded to re: the Hawk pick at #5, is that some years there aren't 32 players considered by scouts as worthy of being a 1st round pick...so those players get picked even though they are 2nd round talent. This year is supposedly one of those years, BTW.
The round (and in the case of the 1st round, where) a player is taken matters from an expectation of talent and performance. I'd expect a Top 5 player to be more likely to make more Pro Bowls over their career than someone taken at the end of the 1st round, and more likely to make the Pro Bowl within 3 years vs. someone taken at the bottom of the 5th round.