GNOME 3 is an easy and elegant way to use your computer. It is designed to put you in control and bring freedom to everybody. GNOME 3 is developed by the GNOME community, a diverse, international group of contributors that is supported by an independent, non-profit foundation.
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Pro Simple and easy to use
GNOME 3 has been designed to make it simple and easy to use. Press a button to view your open windows, launch applications or check if you have new messages.
Pro Clean UI
Every aspect of GNOME 3 has been crafted to fit together as a harmonious whole, so that it offers a consistent and integrated experience.
Pro Highly customisable
Gnome Extensions offers an easy way to extend the built-in functionality
Pro Powerful search
A powerful search feature lets you access all your work from one place.
Pro Does not get in the way
GNOME 3 lets you do the things you want without getting in the way. It won't bother you or badger you with demands, and it has been designed to help you comfortably deal with notifications.
Pro Keyboard friendly
It's (mostly) usable without touching a mouse, so you can keep your hands on the keyboard.
Shortcuts can be defined in the gnome setting.
There are even more shortcuts available when using the gesetting or dconf tool, e.g. switch to desktop 5 to 9.
Pro Very productive
With a clean layout and well-thought keyboard shortcuts, Gnome 3 is simply the best for people looking to be productive with their computer.
Pro Online account management
GNOME 3 integrates with your online accounts, so that all your data can be accessed from the same place.
Pro Easy theming
Changing the look (and feel) of Gnome Shell is easy, shell theme, icon, windows and graphical elements (gtk).
individually for each user.
Mostly its installing some packages or unpacking some archive to a themes folder and using selecting the new theme in e.g. gnome-tweak-tool.
There a lot of really good theme on deviantart.
Pro Great for high dpi displays
Adjustable scaling factor makes it great for high resolution laptops and far away TVs.
Pro Great task manager
The GNOME Task Manager is great, showing all open processes with every needed detail. For each process you can see the amount of memory and processing power that it's using, along with the process priority.
Pro Adheres to standards
Allowing for interoperability and shared technology for X Window System desktops.
Pro Touchscreen friendly
It works well with any touchscreen-enabled system, including newer laptops, even to the point of including a well-designed on-screen keyboard.
Pro Wayland support
Gnome is first desktop environment using Wayland as default instead of X server. X server is only optional curently.
Pro Fallback mode offers a classic look
For people looking for older, more classic looks, Fallback mode offers just that. Ubuntu users can have this option by installing a package called "GNOME-Session-Fallback." In the future to be released GNOME 3.8, the Fallback Mode will not be included, so this is really not a long-term solution.
Pro Gnome-Tweak-Tool and Extensions are great
Gnome may seem bland out of the box but, the Gnome-Tweak-Tool is awesome.
The Gnome-Tweak-Tool allows for easy desktop tweaks and other control functionality, and that these features can be activated with just a click.
Con Extension system is weakly integrated into the environment
Backward compatibility is not guaranteed and extensions seems like second class citizens in the GNOME environment.
Con Tightly coupled to its window manager
If you're looking to run an alternative window manager, like XMonad, you're pretty much out of luck.
Con Depends on systemd
Some people don't like systemd but it is part of most modern distros anyway.
Con Non-intuitive use paradigm
Con Inconsistent desktop
As of GNOME3 , some applications have ClientSideDecorations while other use normal Titlebars, this also affects usablity since both Decorations do different things if you left, right, or double click it. Same goes for Menubars. Some Apps follow the GlobalMenu in the GNOMEShell while others don't.