The assassination attempt is indeed tragic. As for his being a good person, many would disagree. Unfortunately, both within and without Japan, he is a controversial figure. Even if one takes his armament of Japan in a sympathetic light, his historical revisionism, courting of the ultra-right, and tone-deaf nationalism caused troubles domestically and with its neighbors.
All this is unfortunate as he genuinely boosted Japan's economy, doing much to Japan's status in the world[1]. The sibling comments here linked some blog posts calling him a "fascist" or just a patriot ("civic nationalist"). The reality is somewhere in between.