Its the opposite for me: apart from the control concerns which are legitimate albeit hardly so concerning that it overwrites the entire package (especially considering that he was showing much improved control this year), I don't see how you can NOT see the hype. Its elite stuff and elite performance in the best conference in baseball; and he has absolutely dominated an entire slew of elite hitters that wound up as first round picks. His entire package would look elite if he was a RHP too, but he has the added bonus of also being a LHP. I think its lazy analysis to lump him in with a handful of LHP that failed and then make a blanket statement suggesting that there is some inherent flaw with drafting LHP highly. Yes, there IS a tendency of collegiate LHP being pushed up the board because they are LHP, but if you look at the actual stuff on top of the raw performance, you would be foolish to suggest that this is the case with Lacy. You state that David Price is an exception because he went 1st overall, but fail to consider that Lacy was playing so well prior to the season being cancelled that he actually had a real shot of working into 1st overall discussion (Detroit's 2nd option behind Torkelson was also strongly rumored to be Lacy, not Martin or anyone else). I'm not suggesting that Asa Lacy is David Price, but he's certainly in a completely different stratosphere to Tyler Jay, or frankly all of the other names on that list you named.
When you look at the H/9, SO/9, and even HR/9 comparisons of Lacy vs. say Hancock, you immediately see how much more electric Lacy's stuff actually is.