Hi Aldarisx 
You’ve probably seen the benchmarks I’d posted at:
https://us.forums.blizzard.com/en/wow/t/quick-4k-m1-mac-mini-vs-2012egpu-benchmarks/796697
I just want to add that those benchmarks were done in a tough scenario - 4k monitor, 4k resolution, and in a zone that’s difficult to render.
If you’re playing at a lower resolution (e.g. 1080p is 25% as difficult as 4k), or are willing to turn down graphical settings, it should definitely be fun to play on an m1.
Personally I’m using a Matias Ergo Pro split keyboard and didn’t notice any oddness. I also use a Steelseries Rival 500 mouse and while I didn’t test it extensively, for normal day-to-day usage I don’t load any software (although I did use their suite to initially configure it - the settings save to the mouse itself).