Drafting Miller would be my personal NIGHTMARE.
Aldon Smith, at least, has some @$$ to'm: He COULD develop into an Edge Setter.
And God knows his Pass Rushing Repertoire has some MAGIC.
I like Aldon Smith as a prospect A LOT. But he and Miller are different players - like McGinnest and Colvin.
Aldon is not quite as good as McGinnest, but he's the same type of upfield player - will probably be able to set the edge, but may never be good in coverage.
Miller, IMO, is a faster version of Colvin (the pre-hip injury Colvin). Will he set the edge like Vrable or McGinnest? Probably not. But he'll be better than some here think. And he'll make up for it with exceptional open field tackling skills and coverage ability. And he would have the best coach in the business to put him on position to utilize his skills.