It's sillier and less interesting than Maid-Droid. It has little emotional weight, the villain is risible and its best scenes are the goofy android fights. It's throwaway. On the other hand, though, its strange, self-pitying take on sexual politics no longer involves rape. It's still offensive, but easier to laugh at.
It's a sort of pseudo-sequel to Maid-Droid. Akiho Yoshizawa still plays the title character (Maria) and Masayoshi Nogami is still her elderly mentor/master, but they've changed a bunch of stuff.
1. Maria doesn't need a battery any more. Instead her power source is the theta waves from her master's brain, which amazingly enough can be stimulated by fellatio. It's the power of love. Porn plot device alert! "Unless there is at least one occurrence of Master's satisfaction per day, she will shut down."
2. Nogami's character didn't get given Maria. Instead he designed and built it as a gift for the film's otaku virgin hero, Daisuke Haraguchi, who must complete her Love Circuit. That's another corny plot device.
3. Host Droids can now get violent with human women, when they couldn't in the first film due to Asimov's Three Laws of Robotics. They can also do things like embezzlement, getting women to give them money and telling them to work as prostitutes.
4. Maria makes more mechanical noises, which can be annoying. She also has a Star Wars holobeam projector in her groin and her on/off switch is her clitoris. (That's in the literal "turn off a household device" sense.)
The plot's straightforward. The villain (Horiken) has an army of identical Host Droids who have repetitive, agenda-pushing sex scenes with lots of different women. (One of them despises Haraguchi, even though he'd been trying to ask her out.) Meanwhile Haraguchi gets sent his Maid Droid and goes through all the story points that you're imagining, although this can be wittier than you'd guess. On finding Maria prostrate on the floor and needing orgasm energy... "Any time, anywhere, masturbation is a virgin's speciality!"
Host/Maid android combat is where the film's funniest. Shiny White Teeth Beam! Frilly Skirt Deflection! Moe Moe Headband Sword!
That's enough of the plot, though. What about its agenda? What's its message for its target audience? (It's backpedalling even more explicitly than in the first film because much of the following is delivered by the ranting, hammy villain.)
Answer: poor, downtrodden men are being judged on their looks! There's a food chain, with ugly men buying sex from prostitutes who'll then spend all that money on pretty boys at Host Clubs! It's a dictatorship of the beautiful! "For example, during the recent Korean actor boom, housewives have been spending money, which their husbands have earned through hard work, to chase after good-looking actors."
The villain's hatched his evil scheme because he thinks he can't get laid because he's ugly. That can't have been due to being mad and evil, then.
That can't simplistically be called the message. The film has plausible deniability, thanks to using the villain as the mouthpiece. However there's no defending its one-eyed view of women, who are bitches who judge men entirely on their looks and can't shut up about it. This makes sex scenes feel wrong and a bit tiresome. Being slapped around also turns them on. (That, on the other hand, is downright unpleasant.) The film never even hints that women might have it worse than men in being judged on their looks and image, even though both Maid-Droid films gave Maria an "incompetent clumsy scatterbrain" personality to make her (as they saw it) more attractive.
This film is silly and lightweight. The first Maid-Droid was much more important. It was also more offensive, but it also had a meaningful story and surprising emotional weight. Nogami lived with his Maria for sixty years. Here, though, the Haraguchi/Maria relationship is fairly laughable. The Nostalgic Flashback Montage is a joke because they've only been together for a few days. "If you're that rough, Maria will break!" she says as Haraguchi lies there completely motionless, with Maria doing all the work as she rides him cowboy-style. His pathetic otaku-ness can be amusing (e.g. thinking the villain's evil plan sounds quite cool), but this isn't a film that matters.
It's amusing. It has lots of nudity. It's not boring, at least, and it's usually entertaining if you can laugh off its sexual politics. However that's almost the limit of its good points.