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Gordon Bekham was by far the best college hitter in 2008. Alvarez was drafted over Beckham thanks to his tools (although I wouldn't have drafted Alvarez over Beckham).
Beckham had a far better eye and K'ed at half the rate of Alvarez. Heck, he even hit for more power in the same conference.
College hitters aren't a gaurantee, but I'd be shocked if Ackley weren't in the majors at least by some time in '11. Hes one of the most polished guys to come out since Gordon Beckham and Matt Laporta.