Haha absolutely. The movie makes it so much worse though, boy...
I think one of the funniest things ever in the saga to me, in retrospect, is in GoF though. The whole "I don't see how Snape could have gone thid fast anyway, unless he somehow turned into a bat" line when Crouch disappears into the forest. Lol.
But yeah, no one noticing Crouch being on Polyjuice? Major bullshit. And someone as vigilant as Moody woulf have asked people to ask him trick questions everytime they saw him tbh..