So I broke down and watched the first three episodes...
I have a thought that a TV show or Movie doesn't necessarily need to be 100% well written to be enjoyable, due to spectacle and presentation filling in a weakly written scripts. The percentage where something is "good" probably varies per person.
The Mandalorian barely squeaks over the line for me, say somewhere about 65-70% good writing. To its credit, its main 'writing' flaw is that it is underwritten, which works in its favor given the tone its going for. That said, it does rely far too heavily on 'call-backs', mostly the original trilogy, for my tastes.