Not a good ending if this is the series finale. This would be OK if there is another season. There are more unanswered questions now than when we started.
Why does Heaven want Sam to be the Son of the Devil and be damned to Hell? Now not only Sam is damned but Andi is as well and Steve was the one responsible for this. What was with the celestial show at the end? The bit with the house full of Frogs was a little strange. The bit with Sock drinking the drink with the toad in it was pretty funny and the fact that the Priest then exorcised him is hilarious. It probably did more good with Sock than Nina! It was chivalrous of him to run to Ben and Nina's aid though.
It is nice that Andi is happy with Sam and it might be that now she is damned she can accept Sam for what he is and not worry about it. That was some sacrifice for her to do for Sam. She really believes in him. It was nice to see that at the end.
I give this an eight as it may be the end of the show for good. This was not a good finale. Obviously there is a lot more story to tell. Here's hoping that Reaper lives another day in syndication.