So what you get by discouraging a broad diversity of personalities is a mix of people who actually have those specific characteristics and sociopaths. The latter group ends up running the company, and of course they issue utterly sociopathic "psychometric evaluations", which are basically just encoded discrimination against entire classes of people, regardless of job fitness, because the people up top are such incompetent leaders that they need subservient workers to obey their crazy orders without question.
- helpless
- depressed
- jerks
The top one has about %50 shot of being a character flaw, eg, no amount of confidence-building will help.
The middle one has the most hope, if the talent potential is significant. The best in the field can be painfully shy as well as depressed. The problem is that depression (not shyness) hurts morale. [1]
The last has a %75 chance of being a lost cause. Impossible to manage as they are incredibly disruptive to morale and productivity. [2] Their survival is often linked to mastery of politics, which inculcates their position.
[1] http://m.fastcoexist.com/1679208/a-sad-worker-is-a-bad-worke...
[2] The No *sshole Rule by Robert Sutton
That's the value of these tests (when properly applied): They allow an evaluator to make statistically accurate predictions of specific types of behavior. The key is the two words: statistically and specific. A single composite score will not tell you anything, but the idea that there's a 68% chance that the person you're about to hire is a schizophrenic kleptomaniac should give you pause.
I don't remember where I got the number, but apparently something like two-thirds of the regular army still end up unwilling/unable to aim properly when a combat situation actually happens. That's from the Great War, though; procedures may have gotten better since.
You'd think that, but a quality psychometric test can't be gamed if it was developed in-house and is only taken once by the candidate. This particular company might not have had one of those, however.
Professional personality tests can't be gamed - you also can't find these on the internet, because they're very strictly copyrighted.
Instead of trying to get rid of questions that are gameable, the psychometrists design the test with statistical consistency - things as obscure as, say, what color the candidate answers in a multiple choice question out of orange, yellow, blue and red can be used to correlate with other questions (not literally, but to a candidate it would be equally obscure and seemingly innocuous as a question). If a candidate answers one question in what they perceive to be the societal ideal, this will be exposed in other questions where it's not possible to cross-consistently game the question unless you've read and thoroughly understand a manual of psychology or psychometry.
Tests designed this way allow for a certain amount of "gaming" by candidates before it crosses a statistical threshold, at which point it essentially tells the proctor, "The answers are so inconsistent that the candidate wasn't being honest." and you have to throw out the whole test (which in the context of hiring, means rejecting the candidate).
The reason why this works is because while people will answer "Would you consider yourself hard working?" with "Always" or some other unrealistically gamed superlative, they won't realize that other questions that are seemingly unrelated are highly correlated with that quality - if you answer yes to one and no to another, you probably lied on the transparent one, with high confidence.
Tests like this[1] have been around for so long that they consistently get better, though there are some valid criticisms of them being easier for non-minorities (for a variety of reasons). They are used in clinical and professional contexts, and while the quality personality tests will theoretically be consistent across multiple-test takings (in other words, results are relatively immutable), in practice you should probably avoid giving one individual a lot of exposure to the same exact test twice.
Hope that helps.
[1]: http://en.wikipedia.org/wiki/Minnesota_Multiphasic_Personali...
A acquaintance of mine is finishing his dissertation on faking on personality and integrity tests, so I'll know more on that soon.