Well, it comes down to min/max again. I flew the Ki-84 pretty damn exclusively for a tour or so. It doesn't suck. In fact, it is almost as manueverable as a Spit 5 is.
Unfortunately, it lacks Hispanos, which is a big - in the - column, and it is almost as manueverable as the Spit 5, which is another -.
The pluses don't outweigh those two minuses.