Wow, this is really sad. Brand new computer (DELL XPS 15, Windows 8.1) and I am having the same problem -- Wifi drops to either 0 or limited every hour or so. Turning off the wifi and then turning it back on again fixes it immediately, but definitely a pain in the ****.
And yes, we have 10 additional devices using the same wifi in the house, all flawlessly, for years (OSX x 2, iOS x 5, Android x 1, Blackberry x 2). That is fine, for a couple days. But the fact that this has been a widespread and well-documented issue for over six months is pathetic.
Windows Fail.