I honestly don't think anyone is saying you have to give it a worthy try before calling it quits. It's your money, do what you want. The sentiment is more like, "what else did you expect when going to a totally different OS?" With that being said, if you do care to give it a go, 2 weeks just simple not enough time. That's not an unreasonable point. Put it this way, many of us have bad posture that leads to a whole host of health issues. When we're told to fix our posture, and told the proper way to stand and sit, it isn't the most comfortable position. Not for a while. Only after a considerable amount of time with repetition does it get easier. But many give up and go back to what's comfortable within only a short while. They'll tell people they tried, when we all know they really didn't give it the proper time to become familiar and comfortable with the new position. So it really comes down to, "do you really care to take the time?" If not, then don't expect to keep the new device. Again, you're free to do what you want, over and over, but can you honestly say you expect a different outcome?
You have to remember, people only have 2 weeks to return a device, most wont risk being stuck with a phone they don’t like.