Since this appears to be open spoilers…
The Harry Potter series is rife with a grotesque number of them, along with gratuitous over-use of deus ex machina and ludicrously implausible plot contrivances. I could have forgiven it had Rowling put even a small bit in with Firenze the Centaur claiming that the fates were pushing some people to conflict or somesuch.
But anyway…
Throughout most of the series, Voldemort would like it if Harry Potter were offed. Thign is, he always and everywhere goes about it in the most ridiculous way possible, usually trying for some dramatic confrontation under the full moon with ample spectators. In fact, his plans are handily derailed by a pack of preteens and adolescents.
Book One: Ok, he doesn’t want to attract attention throughout most of the book. Does he just kill Harry and then figure out the stone thing? Apparently he realized that Harry was lying and probably had it, but no, rather than just snapping his fingers and BAM dead Harry he winds up losing his borrwed body.
Book Two: Yes, lets send the monster after Harry rather than wasting the helpless, unarmed boy when you had the chance. Real bright.
Book Three: (Voldemort doesn’t really appear here, and this is one reason why I like this book best.)
Book Four: It’s not enough to lure Hary off school grounds and then port him. It must be done as Harry wins the tournament so the evil spell of rebirth can take place. Yeah…
Book Five: I don’t mean to criticize the man for his minions, but Good Night, I’d rather have stormtroopers than this lot of dimwits. A larger group of experienced wizards with no compunction about using really nasty magic and with the advantage of invisibility get their butts kicked by Harry and co. And hard. yeah, eventually the kids get backup, but they take out several of these supposedly fiendish and terrifying dark sorcerers and bamboozle the rest.
Book Six: Let’s put the entire plot in the hands of a rebellious teenager. Yeah, you really want to succeed there, eh Voldey…
Book Seven: Ouch. Yeah, this is basically the “let’s blunder around on brute force” approach. Naturally enough, Voldemort has no idea what he’s doing and spends most of the book doing, well, not much at all. He gets to be Minister of Magic, although why he wanted it is never very clear.
The further I read in the books, I got a sickening sensation that Voldemort was a really lousy villain. He obviously knew more about the technological world than most other wizards, and surely knew that he could easily whack Harry by charming or simply bribing some thug with a Saturday Night Special. Heavy magic use may mess with electronics, but it apparently doesn’t screw with combustion of chemical reactions; the gun would work. And Harry could be taken out anywhere. Voldemort could go with a large force, including several snipers or ambush squads, without any large magical attack. The Ministry of Magic seems to have no defenses against this kind of thing. Likewise, Dumbledore could be wasted quite handily in the streets of Hogsmeade.
Now, DUmbledore is a real issue, and I don’t even want to mention his actions.