The plot had a minimum of padding and held my interest, though the way things ended up didn't exactly come as a big shocker. Have to say, though, that the foreshadowing of the door in the spaceship that wouldn't open slipped by me, and I was therefore taken a little by surprise in the way the wishing machine complied with Dr. Smith's request for a servant.
Special notice should be given to the effort made with the cinematography here. It may look hokey now, but the bizarre camera angles used to heighten the mood or tension of the scenes was probably pretty effective at the time. And I thought the skeletal, disintegrating remains of the alien spaceship were cool and added a little bit of a gothic ambience. Overall you could almost say the story was a blend of sci-fi and horror, maybe 80/20.
The episode wasn't without its humor either, and I don't think the fact that the miraculous wishing device was a silly-looking hat one had to wear was accidental.

Ok episode with a neat moral to it about self-ishness. No great shakes and the plot takes a bit to long to get to the obvious. But its well-executed. Not one of my favs, though.