The sampled voices sound neither like Michael Jackson nor Weird Al. A good effort, but a professional impersonator could likely do better on either front.
Sometimes I’ll watch a movie with voiceover work, where some character has a very specific accent, and I’ll be watching along for twenty minutes and the VA will let slip just a couple syllables of their real voice and my ears will prick up and I’ll think, hey I know this guy. Isn’t that… oh the guy from the thing. From <wrong movie>, no wait I mean <other movie>? Yes, it is.
That’s what this sounds like. Five syllables of Michael Jackson while he’s trying to be Action Hero or Big Villain, or Funny Sidekick (a problem Eddie Murphy has never had, all evidence from Coming to America notwithstanding).
I know what you mean. Its more noticeable (imo) on the Michael one.... but its definitely in there. I think the pitch correction is to blame for a bit of the weirdness.