There are a couple of issues with Mint, the biggest one by far, in my opinion, is the slow update schedule, anything more than 6 months really isn't usable for the desktop, this leads to a reliance on Flatpak and the inability to compile and use a lot of packages. The second biggest issue is Cinnamon, it's outdated, very restrictive, lacks a lot of important features, and is generally ugly (in my opinion of course) you can't even really change the default desktop since the others ones are extremely outdated in the repos. It's still ok to use but just not very compelling beyond it's similarities to Windows when compared to other distros.

I'd generally say that the non-immutable spins of Fedora are way nicer to use due to the larger repos and newer packages. You also don't really lose anything on Fedora that you'd get on Mint, you still have a GUI package manager and installer so even new users can use it intuitively.