BINGO! Plinkett's role in these videos wasn't that of a reviewer/critic, but of a prosecutor, making a case against the prequels and going for death penalty.
Did a very good job, I might add. If I were him, I'd seriously consider career change. Untalented filmmakers are a plenty, but courts could always use another sleazeball lawyer or two.
Mind you, I think the PT is terrible for the most part and enjoy many aspects of Plinkett's reviews. But the reviews are extremely biased, I don't think there is any doubt about that. Your prosecutor analogy is actually fairly apt, I think, if we were to remove the "death penalty" part (I don't really see what that could apply to). Again, I like many aspects of the reviews, but they make a case against Lucas. That is their main goal.
As for that long list of "lies" above, it's really hard to make a convincing case that Plinkett is distorting or warping the reality of what is on film if you are going to present such a warped view of reality yourself. Most of what you list there cannot remotely be construed as lies. They are misinterpretations (maybe), exaggerations, more or less trivial errors, etc. Many are points on which one might reasonably disagree.