I am convinced that at least 30 of those 57 individuals will began to change their mind within 3 weeks of constant use. Initial impressions of anything that has substantially changed, especially something as engrained as the previous iOS, will always be met with negativity.
Slowly, through heavy use, more and more 'non-tech savvy' people will come to love iOS 7.
I thought the same, and had a few use an old 4S for a few days. Additionally, I've been using it since day 1, as well as Pixar and Cupertino friends who were one of many cheering at the keynote. No b.s., they're disappointed still.
Some may change their minds, but when Apple and Pixar corp. employees excited about the release have grown to either hate it or disregard it, that's not a good sign. I like it, I'm indifferent. The current changes are good, and adjusting/increasing contrast in Settings makes a big difference. The features are long overdue. However, I do agree it is over simplified. Removing the skeuomorphism was well overdue, however I think this change could have been handled better if it were more gradual instead of such a severe overhaul.
Just my .02 cents

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Since he decided to share this experiment here its open for criticism (or praise) IMO. I do think its a bit odd that someone would do this.
It is far from odd, why do you think Apple sends out Apple Seed invites to consumers? I merely wanted to ascertain as many opinions as "I" could regarding the drastic changes to the iOS UI as it has been a major point of contention for so many. Just as my post is open for criticism, so if yours

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I guess. But I still think its odd. I can understand Apple brining in people to do testing and provide feedback (which 9to5Mac claims they're doing) but I don't get why anyone else would. For what purpose?
The vast majority of iOS users are not you or me, they're consumers, housewives, business men, the elderly, even kids. My point in my initial post regarding our interpretations will be far different as we are [generally] tech experts; we adapt quicker. The average user is not the same market.
I know if I asked my coworkers or friends to do something like this they'd look at me like I was nuts.
The reason this began for me was due to so many asking to use it after noticing it, not my intentionally going door to door with surveys. I later asked some to answer a few questions over emails, and those were people who truly wanted to give Apple their feedback. As a developer, you should know UI bug reports are taken just as seriously as performance bug reports. Guess I'm "nuts."