I was convinced by some friends to watch this series in spite of my disappointment in the last few Star Wars movies. And wow. This is such a better Star Wars. Character, stakes, story arcs, and good effects use!
This was a good finale to a good series. I was surprised that we saw Mando's face but the context and the reasoning that it was a droid makes sense. I thought it strongly echoed the reveal of Vader in ROJ; seeing the vulnerable human underneath the impenetrable armor is a shock. Based on the rules they have set up, he shouldn't reveal his face unless alone, no matter his relationship with another person. I don't think it's necessary - he's an expressive character even with the helmet.
I have one question about the troopers at the beginning. Was that a real communication about the Moff? I thought that was a faked transmission by IG to give him time to get there. There were no trooper bodies at Gideon's feet when they cut back to the stand-off.
For the first time in a while I can say I'm looking forward to the return of a Star Wars property. This is good as a space western, but it's also good as a space ronin.