My two cents.
I love this new sim, as I can travel so many places and see more accurate scenery.
However, it's got a steeper learning curve, and I find the UI a bit frustrating. Navigation, finding maps, understanding the GPS of a particular aircraft takes time. I haven't used the payware manual yet, but creating a flight plan, and picking waypoints and such seems far less user friendly than in the past. I'll have to keep working on this.
In flight, having access to a map that shows me all the frequencies or nav aids like in FS9 or in FSX doesn't seem to be here in MS2020. That said, the more I play with it, the more I understand, but I miss the simplicity of menu's past.