Rankings are always a crapshoot, HOWEVER, generally speaking, the Top 10-20 kids are usually most likely to be the Top kids in college (and even a better record if in the Top 5).
For 2012, Stewert and Jefferson were the consensus #1 and #2. After that, I believe it was a mix of Jewel Loyd, Alexis Jones, Bashara Graves and Morgan Tuck in the Top 5-6 in most services. Loyd was the #1 pick last year, likely have gone 2 or 3 this year. Jones will likely be a lottery pick next year. Graves underperformed, but coaching plays a factor.
2011: KML and Elizabeth Williams were #1/#2 on most services and would have been drafted 1/2 if not for AZB/Loyd. Massangale and Burdick went to Tennessee... though 2011 was an odd year. Lost of injuries, transfers, etc. Logic was #10 and had a great college career and drafted in the 1st round. Laney had a great career at Rutgers too and drafted in the 2nd round.
2010: Chiney, Sims, Howard, Gray, Schimmel, Hartley, Alyssa Thomas were all generally ranked in the Top 10-15 and had great college careers and drafted in the first round. Dolson was #39 HG, but I believe Top 16 on ASGR and 24 on BS. I do think Dolson getting in shape played a huge role in how well she developed. Honestly, its hard to project how well someone will be in college (Courtney Paris, Danielle Adams, etc). Achonwa didn't play HS ball but I believe ESPN said she would have been a Top 20 prospect. Achonwa, McBride (rated 25ish) and Dolson had the benefit of playing under great coaches.
BTW, Stokes was #14 on BS, and I believe #9 on ASGR.