I am not giving "No Place to Hide" a numerical score for a couple reasons. First, I never watched "Lost in Space" so I really cannot compare this pilot episode to later ones. Second, it isn't designed like a normal episode and the first 1/3 is more a recap of the plot for the CBS execs who were watching this to decide whether or not to give the series the green light.
This pilot is like most pilots....a bit different from the series that followed. Dr. Smith and the Robot are not in the show at all....and this would be hard to explain to the viewers how they suddenly appeared on the ship! But, since the pilot wasn't aired until decades later, this wasn't an issue! The theme song is also very different....mostly because the music wouldn't be written for it unless the show was approved.
Once the explanation of the mission and the characters in the show was given, the ship takes off and is knocked off course by asteroids. The ship lands on a new planet and the place turns out to suck for two reasons: it's really cold (and getting colder) and there are giant humanoid monsters on the planet. The second problem is dealt with in a less than peaceful manner, as young Will Robinson blasts one of them to death! So much for exploring new worlds and making new friends!! There also is a sequence involving Dr. Robinson flying about with a jet pack (a very popular 1960s idea) to look for his daughter who got herself lost. He seems to fly about for a very long time...too bad real jet packs only gave the pilot a few seconds of air time due to fuel consumption.
Overall, mildly interesting...but probably a pilot best seen by lovers of the series instead of grouchy old guys like me. Mildly entertaining and not without merit. However, allowing Mumy to sing "Greensleaves" was a mistake in hindsight. While a very talented child and great actor in shows such as "Babylon 5", his singing is exactly what you'd expect from a small boy....and that is NOT particularly entertaining!