Watford and Hulls weren't highly recruited? I think you're misremembering. Watford was a higher rated recruit than both Morgan and Shake. Hulls was a 4* by some services and that class also had Creek. I think even Elston was a 4* on some services.
2011 is the questionable one. Zeller was the only real good recruit in that class, but he was a program changer. I'd agree with you on that one in terms of 2015 (if it panned out this way) being better on paper.
2012 is a better class IMO in terms of how they were thought of in-coming. I'm not sure it's fair to judge 2015 strictly on rankings and put it higher than 2012 because they didn't pan out. 2015 might not pan out either.
Assuming we landed Bryant, Morgan and Shake for 2015, I'd personally rank them (using their rankings, not their production once on campus):
2013
2012
2009
2014 (You could flip-flop '14 and '15 very easily assuming the class we're assuming for '15)
2015
2011 (This is really a tough one, Zeller is by far the most important recruit to date in this era, but as a class Ethrington and Abel really bring it down)
2010 (On paper the worst class, but in terms of production it's arguable #1)
It's just difficult to compare. Some classes people want to point to rankings, and others they want to point to actual production. I think if we're going to compare classes in a list, we can't bounce around between criteria, and since 2015 hasn't happened yet, I'm going with rankings instead of production.