Recs.
Updated
SpecsUpdate
Pros
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 Minimal and productive UI
Minimal and sleek UI makes for a fast and snappy experience, making the GNOME desktop very productive.
Pro Highly stable
Gnome isn't obviously devoid of flaws, but it's pretty stable - especially in comparison with the KDE Plasma Desktop, which can literally fall apart after installing upgrades (and show a considerable number of error messages) or for whatever reasons - after turning on the computer you can end up without (Plasma) desktop altogether, which I believe IS quite unproductive. It is also noteworthy that many other major desktop environments are based on Gnome, and among these are: Cinnamon, Pantheon and (now dead) Unity.
Pro All the major players in the Linux ecosystem have finally collated on Gnome
Red Hat default = Gnome
Fedora default = Gnome
Debian default = Gnome
Ubuntu default = Gnome
Opensuse default = Gnome
This doesn't mean the others go away, it just means there is a colossal community and industry backing behind Gnome.
The point whether or not it being technically the best option is now off table and irrelevant. It is now the de facto standard. Like it or not.
Pro Integrates with most Google Services
You can use your calendar, drive, contacts and most of Google services with Online Account option. You can show your Google Calendar events on the Gnome's default calendar app, Nautilus (Default file manager of GNOME) almost fully integrated with Google Drive and even you can read your PDF's with Evince (the default built-in PDF reader in GNOME).
Cons
Con Poor stability when running for several days
Every application seems to take its toll on gnome-shell. After several days, it will use a lot of memory and become unstable. It might crash itself. Or it might get so slow that it must be restarted to be usable. It seems that applications using JavaScript accelerate this process.
Con Some settings are not where the user would expect it
E.g. it is not possible to change the keyboard auto-repeat delay or rate from the usual All Setting > Keyboard like, for example, in Unity.
Many settings are considered "tweaks" and require installing a separate utility to adjust.
Further still, some settings are buried in a dconf database.
Con Icon scalability and sorting
The icons in the "apps view" area don't have any additional sizes, the current ones are much too large to be effective for the screen space they use. Also, there is no native way to sort them in Gnome, only a very limited extension. Which means you're pretty much always better off using the search bar if you can.
Con Default alt-tab behaviour is cute but extremely annoying for fast keyboard users
Con Native Gnome dock isn't scalable
The native Gnome dock isn't scalable, which means if you want to change its size you have to download a customized theme for the shell and hope it has the appearance you want. Honestly again just like the icon issue it wastes way too much of the screen on high resolution monitors.
Con Hefty (lots of dependencies)
Gnome 3 in the current state is heavily weighed down by having a lot of functions as requirements, rather than options. You MUST have their email client, calendar, and more installed as the environment relies on them directly for basic functionality. Which is absurd as most other DEs don't require a specific calendar program just to tell you what day it is.
Con Longtime support is hard since every few years GNOME changes its own standards
Everytime something is complete GNOME breaks itself:
Icon naming changes almost every 3 years : once gtk icons were named stock_edit then gtk-edit then edit-edit and currently edit-edit-symbolic
- App icons change also every few years currently they get renamed to an android like scheme eg: org.gnome.Photos.svg instead of gnome-photos.svg however this breaks all common standards esp. since filenames on linux are case sensitive.
GNOMEShell extension also break on almost every release.
Currently Gtk3 has been stabilized however they are already working on GTK4 and 5 so in the worst case your desktop will need to run and support 4 GTK-toolkits at the same time.
Recommendations
Comments
Flagged Pros + Cons
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 Continuous customization and extension issues
They need to sort out their continuous customization and extension issues, which are why many people still prefer KDE or other Desktop environments.
Con Limited customization
To modify anything beyond the wallpaper requires third-party software.
Pro High resultion screens, multi monitor, content creation
If you depend on high resultion screens, multi monitor, or content creation programs you want Gnome.
Pro Highly customisable
Gnome Extensions offers an easy way to extend the built-in functionality.