Speaking as someone who uses Kubuntu also as a day-to-day Linux environment at home, Kubuntu will do about 90% of what you want to do. I've not had problems with browsing the web, handling network drives, seamlessly connecting to bluetooth, taking a picture with my webcam, calling for hours on Skype, writing an office document and distributing it via email as a PDF, or drawing on a PDF with my touchscreen and saving those annotations for later use. KDE also makes things like screen captures and configuring your toolbars and such really easy, and creating a button to make Chromium open in Incognito mode for day-to-day less-tracked browsing was not too hard.

Most Linux environments will do something astonishing which Windows doesn't do: you tell it to install something and it will handle the details of going out and fetching it and installing it on your computer (i.e. an app-store). You can just say one day, "hey, I want lighttpd running on this computer so that I can share this image with a friend without putting it on an image-hosting site," and it'll be rapidly accomplished and ready for your use.

What it will not do, includes Microsoft Silverlight (hence Netflix).

I complain because Linux on the desktop keeps going backwards. The Gnome 3 transition is probably the most recent example of this. For me, Linux is actually further away from being a useful general purpose desktop than it was five years ago; the desktop development process seems to be to make progress then oooh squirrel.