That "inside baseball" criticism aside, I've found the latest release of Ubuntu 14.04 , Trusty Tahr, to be an outstanding Linux desktop both for new users and for professionals.
I've been checking out the Trusty Tahr since its beta two release and I've been very pleased with it. I've been testing it in a VirtualBox virtual machine (VM) on a newer high-end Dell system and on two older test systems: The first was my 2007 Dell Inspiron 530S, which is powered by a 2.2-GHz Intel Pentium E2200 dual-core processor. This PC has 4GBs of RAM, a 500GB SATA (Serial ATA) drive, and an Integrated Intel 3100 GMA (Graphics Media Accelerator) chip set. The second was a 2008-vintage Gateway DX4710. This PC is powered by a 2.5-GHz Intel Core 2 Quad processor, 6GBs of RAM, a 1TB SATA drive, and an Intel GMA 3100 for graphics.
My point in listing these systems' stats in detail is that Ubuntu works just fine even on seven-year old systems.
It's also worth noting that Ubuntu 14.04 is a long-term support (LTS) version. That means that Canonical will be supporting this desktop Linux for five years. In turn, if you use an older PC you could get as much as 13 years of use out of it before you'd need to buy a new PC—just try that with Windows.
Installing Ubuntu remains as easy as ever on older PCs: Download the Ubuntu ISO, burn it to a DVD, boot your PC from the DVD and follow the instructions. If you're stuck with a Windows 8/8.1x PC, dealing with Secure Boot can still be a pain. The easy way around this is to go to the UEFI menu as you boot your PC and disable Secure Boot.
As an LTS, Ubuntu 14.04 doesn't have a lot of new features nor has there been much in the way of changes under the hood. Canonical has decided, for example, to not pull the old stable X window server and the Unity 7 shell for the graphical interface for the newer Mir graphics stack and Unity 8. You'll see those appear first in Ubuntu's smartphone and tablet efforts.
If you want, you can give Mir and Unity 8 a try. To do that, open a terminal and enter the following command:
sudo apt-get install unity8-desktop-session-mir
That's the quickest, cleanest way to install Mir and Unity 8. Both projects are under heavy development so be ready for regular changes.
Ubuntu has made several minor changes to Unity that have lead to major advantages in usability. The first of these is that Unity now has the option of using local menus again. In earlier versions of Unity you had to live with your applications' menu choices being in the master menu bar, ala Mac OS X. That's OK, but if you use a big display—I'm writing this using a 23-inch Samsung monitor—then your menu choices can be a long, long way from your application. By giving you a choice of having them on the main menu bar or on a more traditional local application menu bar, you get to pick what works best for you. For me, with my large monitors, its local menus all the way.
As for its base operating system, Ubuntu uses the Linux 3.13 kernel. This includes security and networking improvements.
For applications, Ubuntu has stuck with its usual defaults. It now uses LibreOffice 4.2.3 for the office suite; Thunderbird 24.4 for e-mail; and Firefox 28 for the Web browser. As always, you can install the programs you want if those don't please you via the Ubuntu Software Center.
Put it all together and what I see is a mature, smooth Linux desktop that would work well for either business or personal use. While old-school Linux users may never learn to love Unity, I think most others will find this latest Ubuntu a true pleasure to use. I know I did.