Various findings for your consideration...

[BellavGFH]

1. When ticked during install specifically, and check/ specific config of /etc/lightdm/lightdm.conf, $USER is not logged in automatically, but still presented with the lightdm log screen, required to give user password.
2. When user attempts to start thunar in cli as root this is never achieved, and user is thrown back to the light dm login screen, required to give a password. After entering the session, thunar was not started.
3. Not for Mint devs specifically, but please note that the available Libreoffice version (24.3) is edge, and thus e.g. has issues like e.g. in the calc application (graphic character placement).

[Harry-W-Haines-III]

In regards to item number 3. You don't know how many times I have seen the Ubuntu package managers bugged about how come they are staying with a LibreOffice release that is nearly two years old on the first day of a new LTS release. This moves the bar forward quite a bit in terms of new features.

[anaximeno]

You probably should create one issue per finding.

[clefebvre]

Tested with Cinnamon edition. Installing with the option to log in automatically -> results in a successful autologin and the following configuration: