The parameters for comparison are so . . . so . . . so subjective!
There are, of course, many objective qualities that could be taken into consideration regarding the performance of the Zero-Sen fighter. Vertical climb rate, armament, range, mass . . . these are all factors that influence the overall flight characteristics of the aircraft.
But, then you quickly start running headlong into other factors that, while they may be objective fact in one regard or another, they must be applied to the argument subjectively. These "subjective facts" (to poorly coin a term) would include the average experience level of various pilots, learned tactics and strategies in battle, strategic resource management, and so on. The context of an engagement certainly is influenced by more factors than just the physical characteristics of the equipment involved.
Even within Japan, perception of the Zero-Sen fighter aircraft is a highly subjective and contentious issue! There are so many factors that form so many opinions, I am left to wonder if there could ever be an objective consensus about any attempt to "rank" the Zero-Sen's "deadliness".
However, I do think we can agree that the Zero-Sen was and is and iconic aircraft that played a significant role, for good and for bad, in the air conflicts of WWII. As with any machine (especially those scrutinized in hindsight), there are going to be good qualities and bad. And it is to that discussion which I think we can apply ourselves with vigor.
My own two yen? Well, there is a certain appearance to the Zero-Sen that is visually appealing, along with other aircraft of its age, such as the Mustang, the Spitfire, and the Messerschmitt Bf 109. If you have ever been to an airshow where one of these aircraft have flown, there is a certain powerful majesty that is easier to appreciate and viscerally more approachable, perhaps, than their jet powered descendants. For all its shortcomings in "safety" and "features", the Zero-Sen was a quick and maneuverable aircraft for its time.
I humbly think it would be a wonderful experience to fly one of these vintage craft in more peaceful times. Which leads me to wonder . . .
Anyone know what is like to fly one of these aircraft with the canopy open???