As a Unity newcomer, I found this series to be extremely beneficial.
The author takes you step-by-step through building a multiplayer FPS game that will introduce you to many features of Unity and C#.
The first dozen+ videos cover all the aspects including server/client communication, player movement and behavior, simple weapons, menus and other GUI elements, health bars, and more. You'll even pick up a little texture experience using GIMP (free photoshop-like app). Later in the series, you'll explore other elements like block building/destruction reminiscent of Minecraft, some advanced weapon stuff, and then the real fun stuff like terrain and water.
I really enjoyed the journey, and appreciate all the time the author put into putting together this in-depth learning experience. I highly recommend this series to anyone interested in learning Unity. By the end, you'll gain a lot of knowledge, and will have a nice base to build your own game on top of. You really do end up with a fully-working game as shown in the preview videos.
The install comes with all of the source files for each step of the series, which means you can skip over parts - I myself started skipping some parts later in the series, as some of the exploration of other topics weren't interesting to me.
Quite a bit of time is spent early-on dealing with client/server setup, and the videos really get you thinking about the challenges that arise when building a multiplayer game.
I found the app didn't work so great with my version of Quicktime, which is required to use it. As it is just a container for the videos, I simply opened up the Steam installation directory and played the videos directly (this is probably why it shows 0 hours on record for me).
Sometimes, the videos move a little slowly, especially if you start to get comfortable with C#. I simply upped the playback speed in Quicktime, and adjusted the pitch a bit to cover the resulting reverb from the mic. This helps get through some of the longer videos more quickly.
Although I'm new to Unity/C#, I do have extensive programming experience in other languages. If you have a similar background, you might find some of the coding trivial, and you'll probably move more quickly through the C# bits. You might also find yourself chuckling a bit at the author's nomenclature and naming conventions.
The tutorial does have some age, and it points you at the suggested older version of Unity to use (version 3.1 I believe). I recommend following the advice, as the newer versions of unity are very different looking. I had no problems editing, running, or building the project files in a later version of Unity once I upgraded to 4.3.4.