Beltran, easily indeed. Top 5 pick with no injury stigma about him, 30/30 written all over him... bust. He's put up adequate numbers but not for a top 5 pick.
Others like Bonds, Schilling, Thome, and even RJ, you knew they had an injury history or were suffering through one. High picks, yet high gamble picks. Beltre and Perez were similar to Beltran in that they had big years but horrible follow ups. I just think a top 5 pick should've done better..