The nice thing about Mate is that it's based on a very mature desktop environment (Gnome 2) and it therefore implements a lot of "small details" that might be missing in other desktop environments. As you experiment with various distros, you generally run into some of these having been left out. Sometimes, it's irksome; sometimes you just wanna throw your computer out the window... One area that sometimes isn't as well implemented as it should be is "drag and drop", and being a developer (especially one who likes to automate a lot of stuff), I have little use for a desktop environment that doesn't fully implement something as important as drag and drop. In Mate, all such drag and drop functionality that I'm aware of appears to be implemented:
1) You can drag files/folders onto a launcher either on the desktop itself or inside the file manager.
2) You can drag files/folders onto application launchers residing on the panel.
3) You can drag files/folders onto a running application. One way I use this is to enter files or folder paths into apps like meld as that's usually a lot easier than browsing to a file/folder. It's also a handy means of entering the complete path to a file/folder in the terminal.
4) You can drag files/folders from one workspace and (via the Workspace Switcher applet) drop them onto any "target" on another workspace. And if you're wanting to drop onto a window that's hidden beneath another window, just drag over the target window's "button" on the Window List applet on the panel to bring up the target window.
5) If you drag something onto a folder, there's an "open" animation that let's you know that you can do the drop.
6) You can drag text between two applications. I use this a lot to enter commands into the terminal that originate from a web page.
So, Mate passes the "drag-n-drop" test with flying colors.
And that's just drag-n-drop--there's lots of other reasons why I'm a Linux Mint/Mate fanboy!
@TNFrank: Love the Dr. Strangelove sig.