Okay, my point of this is NOT to say that rankings don't matter and that a 5-star is the same as a 3-star.
My point will be to show that if any particular high-4 star or 5 star commits (or, perhaps more shockingly now, decommits) there is around a 50% chance that a few years later you won't give a crap. At all. So let's just remember we are talking about 17 year old boys and getting a little too excited (I'm mocking myself, too). Perhaps you're sick of that reminder, but I think it is interesting to review how these classes worked out every once in a while.
Now, of those that we have enough data on, one could break them into five categories: ++ (studs, unimaginable to have been without), + (good starters), R (replacement level, okay starter as senior or probably junior too), - (barely worth a scholarship, sometimes not his fault [injury, etc]), -- (bust, due to injury or transfer possibly)
2002: Gabe Watson (++), Matt Gutierrez (-)
2003: Prescott Burgess (R or +), LaMarr Woodley (++), Shawn Crable (+), Clayton Richard (--), Jim Presley (-), Ryan Mundy (-)
2004: Chad Henne (++), Tim Jamison (+), Alex Mitchell (R), Brett Gallimore (--), Doug Dutch (--)
2005: Kevin Grady (-), Marques Slocum (--), Mario Manningham (++), Antonio Bass (--), Cory Zirbel (--), Terrance Taylor (+), James McKinney (--)
2006: Brandon Graham (++), Stephen Schilling (R or +), Carlos Brown (R or +), Jonas Mouton (R or +), Justin Boren (--), Adam Patterson (-), Greg Matthews (R)
2007: Ryan Mallett, Donovan Warren, Toney Clemons
2008: Darryl Stonum, Boubacar Cissoko, Dann O'Neill
Out of 27 from 02 to 06, that's 5 guys who helped define the era in a good way (Watson, Woodley, Henne, Manningham, Graham). Some might even disagree on Watson. Plus another 3 to 6 (Crable, Jamison, Taylor, maybe Burgess, plus maybe some of the 06s) that were good starters. The rest (and Gutierrez might have been great if he started, Matthews might have had a defining junior season with a better QB, and so on) have had no appreciable impact on your fandom.