In the end, I believe assessing each weapon on its individual characteristics and the attendant physics will yield more solid stats than applying a blanket tool. But it does assume the technical knowledge to make a relevant assessment.
The problem with that idea is that many weapons performed poorly for ergonomic reasons rather than physics reasons, despite technical data that proves a fairly good bit of hardware. The Taurus 10mm one of my roommates bought was theoretically a great weapon. Excellent bench performance, good round, enough mass to reduce felt recoil... but it had severe issues with slide-bite for him. The grip-safety bit me. The trigger guard was too small for our standard Army issue leather gloves. The recoil was very sharp. Not hard, but very sharp and sudden (the frame stopped the slide recoil, at least with the ammo R bought). And that was a new-in-the-cosmoline one.
The Walther PPK and the Čzech Zobriska CZ50 both had issues for many due to the rake angle of the grip making it uncomfortable and/or inaccurate; others, like me, found it a very natural point shooting grip. That's a very real world factor that's best just abstracted out. R couldn't hit the 8 ring at 25m with it; while I was able to point shoot the standard humaniform silhouette all inside the 7, with most in the 9 ring. Aimed, almost always the 9 ring, and with the same weapon that R couldn't hit with. B, like myself, found it comfortable.
The Firestar 45 is another "looks good on paper" - but unless you have big hands, it's potentially uncomfortable to hold due to the double-stacked in-grip detachable magazine making the grip a bit wide. I found it nice, but R couldn't get a comfortable grip. Another friend had one, we both fired it, and I found the rake angle of the grip a bit odd, and R bruised the webbing of his thumb firing it.
And the M16, like a good number of other weapons, has one other nasty bit of ergonomics issue: it's built for right handed shooters, and a lefty can, if not careful, wind up with brass in the face. Even with a brass deflector, it's still less comfortable to shoot it lefty due to gas in the face as it ejects.