"Nothing can go wrong..."
Yes, the plot is simple- the same corporarion from Westworld have regrouped and now seem to be set on world conquest via duplicating world leaders, the implication being that robot duplicates have already taken over the company. It a solid premise, if not exactly original... although the point that humans will despoil the planet if left unchecked is certainly well made.
But it's not the premise but the execution that makes this sequel not only an underappreciated gem but a much better film than its predecessor. The direction is a triumph,with lots of arty touches but not too many for this type of film. Peter Fonda and Blythe Danner (especially) are absolutely superb as Chuck and Tracy. Not only do the characters come across as both likeable and very real, their romantic chemistry is perfect.
And the whole thing sizzles with wit and character, which add an extra dimension of both depth and fun to every scene, from Harry playing poker with "Clark" to the many amused jokes at how many of the park's guests just basically want to have sex with robots, which we all know is what would actually happen. But the film doesn't shine away from the philosophical implications of its premise either.
It is, perhaps, a little cheeky to make such a big deal of Yul Brynner for what is essentially just a cameo, but that is literally the only criticism I can make. And the entire dream sequence is superb. As is the film.