I am actually seriously considering this laptop. Yes, it is underpowered. But how many percent of all notebook users really need to do photo and video editing? Most of them just browse the web, check the email, watch videos, and probably download/listen to some music. Take it this way - most of our laptops that we own are being under-utilised anyway. We don't need that much power in the first place.
I am not being biased towards Apple. Yes, you can't plug in a USB flash drive, but my peers all use cloud sharing services(Google Drive, Dropbox) to share files. Most of the thing we did through ports, we now do wirelessly. This laptop is the future, and even if some other PC manufacturer did it instead of Apple, I would be even more inclined to buy it because it will run Windows.
The problem is that I find MacBooks to perform better than Windows machines on the same hardware, so while I am fairly confident that the new MacBook will be a fine web browsing and YouTube-watching machine, I am not sure how Windows machines will run on a 4.5W processor.