I am unfamiliar with both the guys the A's got, but both are in A ball. They had better trust their scouts to make that deal. Two kids who are likely 2-3 years away, assuming they dont follow the same path as 95% of other prospects and fall on their faces.
I am glad I am not an A's fan...
Nottingham didn't do much of anything prior to this year. But he .326/.387/.543 in the Midwest League, which is a pitcher friendly league. The league average is .253/.320/.357. Nottingham is a 20-year-old catcher. Definitely warrants interest IMO. Mengden's struggled a bit, but Lancaster is a very difficult place to pitch.
Sickels has an article detailing the two prospects:
Evaluating Oakland's newest prospects from the Scott Kazmir Trade - Minor League Ball
Seems like a good haul for an impending free agent IMO.