Again to answer you:
1) You just made up some stats, you don't represent 90% of the users. If you had used green box mode, you might be closer to the truth. P mode? Nope...
2) In P mode, YOU chose the wrong combination, not the camera. In P mode, it creates a list of shutter/aperture settings, and you get to choose amongst them by spinning the dial by the shutter button. Some are good options, some are bad. You chose poorly. You need to learn how P mode works. Green box chooses just 1 combination for you, you don't get to cycle through different options.
But if you're in Program mode, by turning the dial or pressing an arrow button on your camera, you can choose from among other valid shutter speed/aperture combinations. If you want to slow the shutter speed to introduce motion blur, there's no need to switch to Shutter Priority; just spin the dial (or press the arrows or rocker switch) in Program mode. Likewise, if you want to increase the depth of field, move the controls in the opposite direction. If you're not sure how to tweak the Program mode on your camera, check your user guide for details. As you might surmise, you don't necessarily need to use Aperture or Shutter Priority modes as long as you remember that Program mode works this way.
3. 2 stop IS is quite old and won't really save you if you are careless on how you hold your combination. Since you had hardly any time to play with the lens, and have no experience as such, most likely you were careless in how you held the combination, and 2 stop IS (which in my experience is really just 1 stop) wasn't enough.
You had no experience with the lens, you don't seem to know how P mode works, you assume you know how everything works, and how everyone else works, and you assumed wrong. Nothing wrong with that, just admit it and move on. Again, you were the deciding factor in the results, and not the lenses.