Sure, there're hokey special effects, enough over-acting to power a small city for a month, & a plot picked out of a hat, but there's the usual questionable activity of those earthlings & some powerhouse TV regulars of the day.
& I'd wager that this is the only American A/V production in any form, mainstream or experimental, in which a character is chided for reading Kant's Critique of the Pure Reason in the original German.
OTOH, I wonder whether the plot wasn't picked up by an O.L. staffer at the 1964 NY World's Fair, as the spacecraft interior looks an awful lot like the centerpiece of one of the big exhibits my dad & I rode in that summer. & In a variation on the old plot twist, it's the earthlings that compel the alien to see the error of his ways.