I don't think "power users" are mad at the device itself. They already realize this device doesn't cater to their computing needs. The problem is that they know the new MacBook isn't worth it's $1299 price.
Thats debatable, and still, it doesn't justify them getting angry especially when the device, as you put it, does not cater to them.
The quality of internal components does not justify the cost.
Quality or lack of power?
Will this directly affect the "power user"? Absolutely not. The same can be said about the Apple Watch edition. You could hear a pin drop in that place when Cook announced its starting price. Why? Because everyone in there (including Apple employees, knew it was overpriced).
Again, that's debatable. Heck, some of the people who posted in these forums assumed the price to be around $800 and above. They obviously don't think the Watch is overpriced.
The bottom line is that people shouldn't let those who are less knowledgable in a particular area to be to be unknowingly ripped off.
I agree, but this is not one of those situations. The value of something depends on the people who want or need it. They will either buy it or they won't. Some people thought those of us who opted for the MacBook instead of the MacBook Pro were being ripped off, and yet, here I am 6 years later still rocking that same MacBook and running OS X Yosemite without any problems. I know for a fact that I've gotten more than my money's worth from it.
Once the purchaser knows the pros and cons then the decision is up to them, but at least they will be well informed which is what the "power users" are doing.
People like me who want the new MacBook are well-informed, but there will be people who will shake their heads because they will not be able to understand why we still choose to get the new MacBook when a more powerful device can be had for less. We hear the same argument with the iPhone in comparison to a more powerful Android device. We like what we like, and want what we want and knows what is best for ourselves than anyone else. It's really that simple...