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Linux Mint is a community-driven Linux distribution based on Debian and Ubuntu that strives to be a "modern, elegant and comfortable operating system which is both powerful and easy to use." Linux Mint provides full out-of-the-box multimedia support by including some proprietary software and comes bundled with a variety of free and open-source applications.
The project was conceived by Clément Lefèbvre and is being actively developed by the Linux Mint Team and community.
SpecsUpdate
Pros
Pro Familiar user interface
Mint is highly recommended for both users coming from Windows, as well as users coming from Ubuntu, but unhappy with Ubuntu's recent, rather dramatic interface changes. Mint provides an updated interface with a look and feel similar to Gnome 2, with an application menu reminiscent of the Windows 7 Start Menu, with categorization and search.
Pro Already functional out-of-the-box
Mint comes bundled with software for browsing the web, editing pictures, browsing files, watching videos and even a full office suite (LibreOffice). An average user can use Mint right away after a fresh install, using all the software that comes with the distribution to complete most of their daily tasks.
Pro Compatibility with Debian and Ubuntu software builds and repositories
Mint gains a very strong package ecosystem and software manager of Debian, including more than 30,000 packages available from the Debian repositories.
Pro Complete and stable
It's based upon Ubuntu LTS or Debian.
It depends on which one you select - Linux Mint or Linux Mint Debian Edition.
The Debian Edition is even more stable.
Pro Easy installation and configuration
Linux Mint uses the same installer as Ubuntu. It is very easy to use for beginners, and also allows more advanced users to choose their own partitions. Linux Mint's Cinnamon desktop is highly customizable and can be made to look however preferred.
Pro Provides LTS (long term support) versions
Long Term Support versions are versions of software that are continuously updated for an extended period of time, even after newer versions are launched. LTS versions will typically get feature additions and enhancements for an extended period of time, then security updates up until its End of Life. An LTS release should typically be considered good for at least 5 years.
Pro Good community support
There are several different ways to get support for this distribution, including the forums, their IRC channel, or their github repositories if you think their software isn't behaving as it should.
Pro Dedicated upgrade process
The Linux Mint team is very dedicated to upgrading and improving Mint, to the point where the releases are fairly predictable. They are also dedicated to their users, meaning that they are responsive to critiques, suggestions, etc.
Pro Popular
Linux Mint is currently the most hit page on DistroWatch. Because of its popularity, long-term support is pretty guaranteed.
Pro There is a "system restore" tool to restore the OS if something breaks
This tool backs up the core OS files to an external drive with an option for full encryption.
Pro Low learning curve to go from installation to advanced configuration
Mint is extremely easy to install, and with community support, easy to move onto adjusting the OS to meet your specific needs. The vast majority of instructions for undertaking configuration work and are easy to understand.
Pro Mint 20 will actively avoid the Snap landmine planted by Canonical in Ubuntu 20.04.
Pro 2016 hack listed here as a Con, was very quickly dealt with and is a non-issue over 4 years later.
Pro MATE desktop (as an option)
MATE is a classic desktop as opposed to the newer "Unity" desktop. For people who prefer the classic style this is one of only few modern distributions with still active MATE desktop development.
Cons
Con The Linux Mint website once provided spyware
The website for Linux Mint was hacked in 2016 and its download links led to a modified ISO, which contained spyware.
Con Upgrade process between version can be painful
The Linux Mint team offers a method to upgrade the OS between versions but they tend to recommend clean installs, which isn't always suitable for everyone. However, following the upgrade process currently is less than straightforward and is easily capable of leaving your system in a confused state.
Con System updates can lead the system to being unstable
While a new installed system is stable, after an update, there is a slight chance of something not working.
Con Cinamon environment is not beautiful and in the same time KDE environment is no longer used.
Con Cheap Windows substitute
Mint tries to be like Windows when it could be different and provide options.
Con Many proprietary (closed-source) packages
By default, Linux Mint includes almost all the proprietary packages just to improve the user experience.
Con Linux Mint tries to force people to use less powerful custom package management system
The custom package management system is slow, frustrating, and forces you to select and install one package at a time. Can't select a whole load of packages and then run the installations in one go.
Con Too many kernel crashes
Linux Mint Xfce keeps crashing 5-6 times a day with no way to fix it. Endless rebooting. It is the most unstable distro.
Recommendations
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Out of Date Pros + Cons
Con Security may be an issue
Linux Mint by default does not have auto updates turned on for important packages such as xorg or the kernel, thus leaving users with potentially insecure software.