Not sure how many, All stars/front end rotation, regulars/mid-to-back end rotation/closer, utility/middle relief players you should expect from one draft but:
2008
Castro - Likely a regular
Lyles - Possibe Allstar
Shuck - Utility player
Still not done yet: Seaton, Luis Cruz, Simunic, Rene Garcia
I'd rate this draft good.
2009 (not Hecks best moment)
Keuchel - I still think he can service as a more permanent back end rotation (not there yet)
JD Martinez - He's a regular now but only because of the team he's on. Should rate as a high as a utlility player though.
Still not done yet: Mier, Bushue, Nash, Meyer, Wikoff, Enrique Hernandez, Erik Castro, Goebbert
I'd rate this draft poor. Would require a real late turnaround from Mier/Nash/Bushue/Meyer to bring this one out of the hole.
2010
Nobody in the majors yet but not surprising since 3 of the top 4 were HS
DeShields - Still a potential all star
Folty - potential front of rotation
Velasquez - potential front of rotation
Wates - likely to at least get Utility role at some point
Doran - Could see middle relief or bust
Roberto Pena - long ways to go but improving
Buchanan - mid-to-back end rotation still possible
Alex Sogard - possible middle releif
Not done yet: Shirley, Robinson, Jordan Scott, Jamaine Cotton, Chis Wallace,
I'd rate this draft very good at this point with the possibility to get better or worse
2011
Springer - potential all star
Houser - long ways to go
Jack Armstrong - been a long wait to see him toss a pitch
Tropeano - potential mid-to-back end rotation
Plethora of folks that haven't defined their career either way
Too early to rate
2012 - considered to be one of the best drafts of all time. Can't rate yet for obvious reasons.
ETA. Prior to 2012, Heck had only an 8th, 10th and 11th overall pick.