I've always had a lot of love for Smith and Jones, even if it isn't everyone's favourite episode. I think it is such a wonderful and clean entry point for the series.

It feels like an episode full of joy. Our characters might be in danger but the Judoon represent a fun threat more than a spooky one. The old lady is pretty brutal with her special straw but it all is played largely for laughs. David Tennant gets a lot of great comedy bits, and though one's mileage may vary in that regard, it's still just a solid introduction to Martha and a pretty important episode as an introduction for the Judoon (who I've always had a special place in my heart for).

All told it is pretty solid. Great set-up and pay-off with the tie to frame and subtly introduce a bit of time travel in a story otherwise focused on some fun with the Judoon on the moon. It's silly but the hospital setting and scenario gave the episode a lot of structure. On the whole, I think it all worked out quite well.