Sorry, but no. If math works that swords would actually become more useful than guns...then that's just more evidence that bioware didn't know WTF they were doing or were just trying to turn ME into a starwars/fantasy clone.
The more I'm thinking about it, the more disappointed I'm becoming in ME. The codex and all the inconsistencies are starting to pile up on me.
Edit: Even if your math is right--Swords would still be a no. It'd be bayonet drill. It's dumb to equip people with swords and a rifle. That's why armies stopped doing it; even after experiments with sword bayonets the armies went back to points on the rifles. Which...sadly ME started doing without actual animations.
Sigh.