I'm obviously super biased, but I think the core installation process is nearly as straightforward as it could possibly be without official support. All of the cores are distributed in a way that you can simply unzip the asset to the root of your SD card, and the core is set up and ready to go.

The only part I would really have to complain about is the folder names, particularly for ROMs. For SNES for example, ROMs are stored at `/Assets/snes/common/rom.smc`, where obviously `common` is an annoying addition to the path.