The Hogan is absolutely not perfect (as a process) and otherwise desirable pilots will get shot down for various reasons while on the other hand undesirable pilots have gamed the system and made it though that stage.

But on the Macro scale it appears that UA is happy with the results so here we are. As a screening tool the positives appear to outweigh the negatives.

The narrowbody CAs that I know speak very highly of the caliber and attitudes of our new hires, with the obvious exception(s) that always occur regardless of the process, so they are apparently doing something right.